251355331500401 has 4 divisors (see below), whose sum is σ = 255615591356400. Its totient is φ = 247095071644404.

The previous prime is 251355331500397. The next prime is 251355331500409. The reversal of 251355331500401 is 104005133553152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 251355331500401 - 2² = 251355331500397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251355331500409) 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, 2130129927911 + ... + 2130129928028.

It is an arithmetic number, because the mean of its divisors is an integer number (63903897839100).

Almost surely, 2^{251355331500401} is an apocalyptic number.

It is an amenable number.

251355331500401 is a deficient number, since it is larger than the sum of its proper divisors (4260259855999).

251355331500401 is an equidigital number, since it uses as much as digits as its factorization.

251355331500401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260259855998.

The product of its (nonzero) digits is 135000, while the sum is 38.

The spelling of 251355331500401 in words is "two hundred fifty-one trillion, three hundred fifty-five billion, three hundred thirty-one million, five hundred thousand, four hundred one".