251240253 has 32 divisors (see below), whose sum is σ = 382717440. Its totient is φ = 145199040.

The previous prime is 251240233. The next prime is 251240257. The reversal of 251240253 is 352042152.

It is not a de Polignac number, because 251240253 - 2⁵ = 251240221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251240257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77850 + ... + 81012.

It is an arithmetic number, because the mean of its divisors is an integer number (11959920).

Almost surely, 2^251240253 is an apocalyptic number.

It is an amenable number.

251240253 is a deficient number, since it is larger than the sum of its proper divisors (131477187).

251240253 is a wasteful number, since it uses less digits than its factorization.

251240253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 251240253 is about 15850.5600216522. The cubic root of 251240253 is about 631.0005542142. Note that the first 3 decimals are identical.

The spelling of 251240253 in words is "two hundred fifty-one million, two hundred forty thousand, two hundred fifty-three".