154551 has 4 divisors (see below), whose sum is σ = 206072. Its totient is φ = 103032.

The previous prime is 154543. The next prime is 154571. The reversal of 154551 is 155451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155451 = 3 ⋅51817.

It is not a de Polignac number, because 154551 - 2³ = 154543 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25756 + ... + 25761.

It is an arithmetic number, because the mean of its divisors is an integer number (51518).

2¹⁵⁴⁵⁵¹ is an apocalyptic number.

154551 is a deficient number, since it is larger than the sum of its proper divisors (51521).

154551 is an equidigital number, since it uses as much as digits as its factorization.

154551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51520.

The product of its digits is 500, while the sum is 21.

The square root of 154551 is about 393.1297495739. The cubic root of 154551 is about 53.6649348532.

Subtracting 154551 from its reverse (155451), we obtain a square (900 = 30²).

It can be divided in two parts, 1545 and 51, that added together give a triangular number (1596 = T₅₆).

The spelling of 154551 in words is "one hundred fifty-four thousand, five hundred fifty-one".