251230431 has 4 divisors (see below), whose sum is σ = 334973912. Its totient is φ = 167486952.

The previous prime is 251230423. The next prime is 251230489. The reversal of 251230431 is 134032152.

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

It is not a de Polignac number, because 251230431 - 2³ = 251230423 is a prime.

It is a super-2 number, since 2×251230431² = 126233458920891522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251230398 and 251230407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251230631) 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, 41871736 + ... + 41871741.

It is an arithmetic number, because the mean of its divisors is an integer number (83743478).

Almost surely, 2^251230431 is an apocalyptic number.

251230431 is a deficient number, since it is larger than the sum of its proper divisors (83743481).

251230431 is an equidigital number, since it uses as much as digits as its factorization.

251230431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83743480.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 251230431 is about 15850.2501872999. The cubic root of 251230431 is about 630.9923313171.

Adding to 251230431 its reverse (134032152), we get a palindrome (385262583).

The spelling of 251230431 in words is "two hundred fifty-one million, two hundred thirty thousand, four hundred thirty-one".