251975642 has 8 divisors (see below), whose sum is σ = 379171956. Its totient is φ = 125584992.

The previous prime is 251975641. The next prime is 251975671. The reversal of 251975642 is 246579152.

251975642 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 250937281 + 1038361 = 15841^2 + 1019^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×251975642² = 126983448322624328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 251975642.

It is not an unprimeable number, because it can be changed into a prime (251975641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200633 + ... + 201884.

Almost surely, 2^251975642 is an apocalyptic number.

251975642 is a deficient number, since it is larger than the sum of its proper divisors (127196314).

251975642 is a wasteful number, since it uses less digits than its factorization.

251975642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402832.

The product of its digits is 151200, while the sum is 41.

The square root of 251975642 is about 15873.7406429613. The cubic root of 251975642 is about 631.6156080666.

The spelling of 251975642 in words is "two hundred fifty-one million, nine hundred seventy-five thousand, six hundred forty-two".