251313401 has 4 divisors (see below), whose sum is σ = 251644404. Its totient is φ = 250982400.

The previous prime is 251313389. The next prime is 251313421. The reversal of 251313401 is 104313152.

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

It can be written as a sum of positive squares in 2 ways, for example, as 76545001 + 174768400 = 8749^2 + 13220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251313401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251313421) 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, 164360 + ... + 165881.

It is an arithmetic number, because the mean of its divisors is an integer number (62911101).

Almost surely, 2^251313401 is an apocalyptic number.

It is an amenable number.

251313401 is a deficient number, since it is larger than the sum of its proper divisors (331003).

251313401 is an equidigital number, since it uses as much as digits as its factorization.

251313401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331002.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 251313401 is about 15852.8672800853. The cubic root of 251313401 is about 631.0617863738.

Adding to 251313401 its reverse (104313152), we get a palindrome (355626553).

The spelling of 251313401 in words is "two hundred fifty-one million, three hundred thirteen thousand, four hundred one".