• 254 can be written using four 4's:

See also 113.

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254 has 4 divisors (see below), whose sum is σ = 384. Its totient is φ = 126.

The previous prime is 251. The next prime is 257. The reversal of 254 is 452.

254 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (251) and next prime (257).

It is a sliding number, since 254 = 4 + 250 and 1/4 + 1/250 = 0.254.

It is an alternating number because its digits alternate between even and odd.

It is a pancake number, because a pancake can be divided into 254 parts by 22 straight cuts.

It is a Curzon number.

It is a plaindrome in base 13 and base 15.

It is a nialpdrome in base 2, base 4, base 11 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62 + ... + 65.

It is an arithmetic number, because the mean of its divisors is an integer number (96).

254 is a deficient number, since it is larger than the sum of its proper divisors (130).

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

254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129.

The product of its digits is 40, while the sum is 11.

The square root of 254 is about 15.9373774505. The cubic root of 254 is about 6.3330255314. Note that the first 3 decimals are identical.

Subtracting from 254 its sum of digits (11), we obtain a 5-th power (243 = 3⁵).

It can be divided in two parts, 25 and 4, that multiplied together give a square (100 = 10²).

The spelling of 254 in words is "two hundred fifty-four", and thus it is an aban number.