251283985 has 16 divisors (see below), whose sum is σ = 322007040. Its totient is φ = 187830720.

The previous prime is 251283973. The next prime is 251283997. The reversal of 251283985 is 589382152.

251283985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (251283973) and next prime (251283997).

It is not a de Polignac number, because 251283985 - 2²³ = 242895377 is a prime.

It is a super-2 number, since 2×251283985² = 126287282234960450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23457 + ... + 32446.

It is an arithmetic number, because the mean of its divisors is an integer number (20125440).

Almost surely, 2^251283985 is an apocalyptic number.

It is an amenable number.

251283985 is a deficient number, since it is larger than the sum of its proper divisors (70723055).

251283985 is a wasteful number, since it uses less digits than its factorization.

251283985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55968.

The product of its digits is 172800, while the sum is 43.

The square root of 251283985 is about 15851.9394712445. The cubic root of 251283985 is about 631.0371636812.

The spelling of 251283985 in words is "two hundred fifty-one million, two hundred eighty-three thousand, nine hundred eighty-five".