251255361 has 16 divisors (see below), whose sum is σ = 383137664. Its totient is φ = 143472384.

The previous prime is 251255309. The next prime is 251255369. The reversal of 251255361 is 163552152.

It is a happy number.

It is not a de Polignac number, because 251255361 - 2⁷ = 251255233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251255369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33951 + ... + 40683.

It is an arithmetic number, because the mean of its divisors is an integer number (23946104).

Almost surely, 2^251255361 is an apocalyptic number.

251255361 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

251255361 is a deficient number, since it is larger than the sum of its proper divisors (131882303).

251255361 is a wasteful number, since it uses less digits than its factorization.

251255361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8520.

The product of its digits is 9000, while the sum is 30.

The square root of 251255361 is about 15851.0365907091. The cubic root of 251255361 is about 631.0132020883.

The spelling of 251255361 in words is "two hundred fifty-one million, two hundred fifty-five thousand, three hundred sixty-one".