251139402942 has 16 divisors (see below), whose sum is σ = 507251864592. Its totient is φ = 82884291200.

The previous prime is 251139402929. The next prime is 251139402961. The reversal of 251139402942 is 249204931152.

It is a junction number, because it is equal to n+sod(n) for n = 251139402894 and 251139402903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207210123 + ... + 207211334.

It is an arithmetic number, because the mean of its divisors is an integer number (31703241537).

Almost surely, 2^251139402942 is an apocalyptic number.

251139402942 is an abundant number, since it is smaller than the sum of its proper divisors (256112461650).

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

251139402942 is a wasteful number, since it uses less digits than its factorization.

251139402942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414421563.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 251139402942 in words is "two hundred fifty-one billion, one hundred thirty-nine million, four hundred two thousand, nine hundred forty-two".