251261602130 has 32 divisors (see below), whose sum is σ = 563870194560. Its totient is φ = 78315304320.

The previous prime is 251261602129. The next prime is 251261602159. The reversal of 251261602130 is 31206162152.

It is a junction number, because it is equal to n+sod(n) for n = 251261602093 and 251261602102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163156115 + ... + 163157654.

It is an arithmetic number, because the mean of its divisors is an integer number (17620943580).

Almost surely, 2^251261602130 is an apocalyptic number.

251261602130 is an abundant number, since it is smaller than the sum of its proper divisors (312608592430).

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

251261602130 is a wasteful number, since it uses less digits than its factorization.

251261602130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326313794.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 251261602130 its reverse (31206162152), we get a palindrome (282467764282).

The spelling of 251261602130 in words is "two hundred fifty-one billion, two hundred sixty-one million, six hundred two thousand, one hundred thirty".