251631120272 has 40 divisors (see below), whose sum is σ = 575156854272. Its totient is φ = 104363136000.

The previous prime is 251631120271. The next prime is 251631120329. The reversal of 251631120272 is 272021136152.

It is not an unprimeable number, because it can be changed into a prime (251631120271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36233729 + ... + 36240672.

Almost surely, 2^251631120272 is an apocalyptic number.

It is an amenable number.

251631120272 is an abundant number, since it is smaller than the sum of its proper divisors (323525734000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251631120272 is a wasteful number, since it uses less digits than its factorization.

251631120272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72474447 (or 72474441 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 251631120272 in words is "two hundred fifty-one billion, six hundred thirty-one million, one hundred twenty thousand, two hundred seventy-two".