251273442 has 32 divisors (see below), whose sum is σ = 604569600. Its totient is φ = 68013648.

The previous prime is 251273411. The next prime is 251273443. The reversal of 251273442 is 244372152.

251273442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-5 number, since 5×251273442⁵ (a number of 43 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (251273443) 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, 156642 + ... + 158237.

It is an arithmetic number, because the mean of its divisors is an integer number (18892800).

Almost surely, 2^251273442 is an apocalyptic number.

251273442 is an abundant number, since it is smaller than the sum of its proper divisors (353296158).

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

251273442 is a wasteful number, since it uses less digits than its factorization.

251273442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314910.

The product of its digits is 13440, while the sum is 30.

The square root of 251273442 is about 15851.6069216972. The cubic root of 251273442 is about 631.0283381846.

The spelling of 251273442 in words is "two hundred fifty-one million, two hundred seventy-three thousand, four hundred forty-two".