251215545130 has 48 divisors (see below), whose sum is σ = 500369221800. Its totient is φ = 90737947520.

The previous prime is 251215545083. The next prime is 251215545149. The reversal of 251215545130 is 31545512152.

It can be written as a sum of positive squares in 4 ways, for example, as 104182409529 + 147033135601 = 322773^2 + 383449^2 .

It is a super-2 number, since 2×251215545130² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 516409 + ... + 876988.

Almost surely, 2^251215545130 is an apocalyptic number.

251215545130 is a deficient number, since it is larger than the sum of its proper divisors (249153676670).

251215545130 is a wasteful number, since it uses less digits than its factorization.

251215545130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393575 (or 1393564 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 34.

The spelling of 251215545130 in words is "two hundred fifty-one billion, two hundred fifteen million, five hundred forty-five thousand, one hundred thirty".