• 154 can be written using four 4's:

154 has 8 divisors (see below), whose sum is σ = 288. Its totient is φ = 60.

The previous prime is 151. The next prime is 157. The reversal of 154 is 451.

154 is nontrivially palindromic in base 6, base 8, base 9 and base 13.

154 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

154 is an esthetic number in base 8 and base 16, because in such bases its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (151) and next prime (157).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a pancake number, because a pancake can be divided into 154 parts by 17 straight cuts.

154 is an undulating number in base 6, base 8 and base 9.

Its product of digits (20) is a multiple of the sum of its prime divisors (20).

154 is a nontrivial repdigit in base 13.

It is a plaindrome in base 13 and base 16.

It is a nialpdrome in base 7, base 13, base 14 and base 15.

It is a zygodrome in base 13.

It is a self number, because there is not a number *n* which added to its sum of digits gives 154.

It is a congruent number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9 + ... + 19.

It is an arithmetic number, because the mean of its divisors is an integer number (36).

154 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

154 is the 7-th nonagonal number.

154 is a deficient number, since it is larger than the sum of its proper divisors (134).

154 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (153) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (20).

154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20.

The product of its digits is 20, while the sum is 10.

The square root of 154 is about 12.4096736460. The cubic root of 154 is about 5.3601084110.

Subtracting from 154 its sum of digits (10), we obtain a square (144 = 12^{2}).

Multiplying 154 by its sum of digits (10), we get a triangular number (1540 = T_{55}).

It can be divided in two parts, 1 and 54, that added together give a palindrome (55).

The spelling of 154 in words is "one hundred fifty-four", and thus it is an aban number.

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