251325431 has 4 divisors (see below), whose sum is σ = 287229072. Its totient is φ = 215421792.

The previous prime is 251325421. The next prime is 251325461. The reversal of 251325431 is 134523152.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251325431 is a prime.

It is a super-2 number, since 2×251325431² = 126328944534671522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251325431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251325421) 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, 17951810 + ... + 17951823.

It is an arithmetic number, because the mean of its divisors is an integer number (71807268).

Almost surely, 2^251325431 is an apocalyptic number.

251325431 is a deficient number, since it is larger than the sum of its proper divisors (35903641).

251325431 is an equidigital number, since it uses as much as digits as its factorization.

251325431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35903640.

The product of its digits is 3600, while the sum is 26.

The square root of 251325431 is about 15853.2467021743. The cubic root of 251325431 is about 631.0718555439.

Adding to 251325431 its reverse (134523152), we get a palindrome (385848583).

The spelling of 251325431 in words is "two hundred fifty-one million, three hundred twenty-five thousand, four hundred thirty-one".