251487288213 has 16 divisors (see below), whose sum is σ = 391039516800. Its totient is φ = 143707021248.

The previous prime is 251487288211. The next prime is 251487288263. The reversal of 251487288213 is 312882784152.

It is not a de Polignac number, because 251487288213 - 2¹ = 251487288211 is a prime.

It is a super-2 number, since 2×251487288213² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251487288211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122198820 + ... + 122200877.

It is an arithmetic number, because the mean of its divisors is an integer number (24439969800).

Almost surely, 2^251487288213 is an apocalyptic number.

It is an amenable number.

251487288213 is a deficient number, since it is larger than the sum of its proper divisors (139552228587).

251487288213 is an equidigital number, since it uses as much as digits as its factorization.

251487288213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244399721 (or 244399707 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 51.

The spelling of 251487288213 in words is "two hundred fifty-one billion, four hundred eighty-seven million, two hundred eighty-eight thousand, two hundred thirteen".