251261130 has 32 divisors (see below), whose sum is σ = 634766400. Its totient is φ = 63476352.

The previous prime is 251261093. The next prime is 251261141. The reversal of 251261130 is 31162152.

It is a junction number, because it is equal to n+sod(n) for n = 251261097 and 251261106.

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, 219835 + ... + 220974.

It is an arithmetic number, because the mean of its divisors is an integer number (19836450).

Almost surely, 2^251261130 is an apocalyptic number.

251261130 is an abundant number, since it is smaller than the sum of its proper divisors (383505270).

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

251261130 is a wasteful number, since it uses less digits than its factorization.

251261130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440838.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 251261130 is about 15851.2185651451. The cubic root of 251261130 is about 631.0180315538.

The spelling of 251261130 in words is "two hundred fifty-one million, two hundred sixty-one thousand, one hundred thirty".