251533065 has 32 divisors (see below), whose sum is σ = 460984320. Its totient is φ = 114727104.

The previous prime is 251533033. The next prime is 251533097. The reversal of 251533065 is 560335152.

It is an interprime number because it is at equal distance from previous prime (251533033) and next prime (251533097).

It is not a de Polignac number, because 251533065 - 2⁵ = 251533033 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48676 + ... + 53594.

It is an arithmetic number, because the mean of its divisors is an integer number (14405760).

Almost surely, 2^251533065 is an apocalyptic number.

It is an amenable number.

251533065 is a deficient number, since it is larger than the sum of its proper divisors (209451255).

251533065 is a wasteful number, since it uses less digits than its factorization.

251533065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5421.

The product of its (nonzero) digits is 13500, while the sum is 30.

The square root of 251533065 is about 15859.7939772243. The cubic root of 251533065 is about 631.2455956298.

The spelling of 251533065 in words is "two hundred fifty-one million, five hundred thirty-three thousand, sixty-five".