251264285 has 8 divisors (see below), whose sum is σ = 302780160. Its totient is φ = 200169424.

The previous prime is 251264281. The next prime is 251264297. The reversal of 251264285 is 582462152.

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

It is a cyclic number.

It is not a de Polignac number, because 251264285 - 2² = 251264281 is a prime.

It is a super-2 number, since 2×251264285² = 126267481833122450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251264281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103937 + ... + 106326.

It is an arithmetic number, because the mean of its divisors is an integer number (37847520).

Almost surely, 2^251264285 is an apocalyptic number.

It is an amenable number.

251264285 is a deficient number, since it is larger than the sum of its proper divisors (51515875).

251264285 is a wasteful number, since it uses less digits than its factorization.

251264285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210507.

The product of its digits is 38400, while the sum is 35.

The square root of 251264285 is about 15851.3180839954. The cubic root of 251264285 is about 631.0206727019.

The spelling of 251264285 in words is "two hundred fifty-one million, two hundred sixty-four thousand, two hundred eighty-five".