251251270990 has 16 divisors (see below), whose sum is σ = 459002323152. Its totient is φ = 99000500544.

The previous prime is 251251270987. The next prime is 251251271017. The reversal of 251251270990 is 99072152152.

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, 187500279 + ... + 187501618.

It is an arithmetic number, because the mean of its divisors is an integer number (28687645197).

Almost surely, 2^251251270990 is an apocalyptic number.

251251270990 is a deficient number, since it is larger than the sum of its proper divisors (207751052162).

251251270990 is a wasteful number, since it uses less digits than its factorization.

251251270990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375001971.

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 251251270990 in words is "two hundred fifty-one billion, two hundred fifty-one million, two hundred seventy thousand, nine hundred ninety".