251872030 has 16 divisors (see below), whose sum is σ = 454572720. Its totient is φ = 100481472.

The previous prime is 251872021. The next prime is 251872063. The reversal of 251872030 is 30278152.

It is a self number, because there is not a number n which added to its sum of digits gives 251872030.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29439 + ... + 37018.

It is an arithmetic number, because the mean of its divisors is an integer number (28410795).

Almost surely, 2^251872030 is an apocalyptic number.

251872030 is a deficient number, since it is larger than the sum of its proper divisors (202700690).

251872030 is a wasteful number, since it uses less digits than its factorization.

251872030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66843.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 251872030 is about 15870.4766784114. The cubic root of 251872030 is about 631.5290230725.

The spelling of 251872030 in words is "two hundred fifty-one million, eight hundred seventy-two thousand, thirty".