251565152 has 12 divisors (see below), whose sum is σ = 495268956. Its totient is φ = 125782560.

The previous prime is 251565131. The next prime is 251565161.

251565152 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 7861411 = 251565152 / (2 + 5 + 1 + 5 + 6 + 5 + 1 + 5 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3930674 + ... + 3930737.

It is an arithmetic number, because the mean of its divisors is an integer number (41272413).

Almost surely, 2^251565152 is an apocalyptic number.

It is an amenable number.

251565152 is a deficient number, since it is larger than the sum of its proper divisors (243703804).

251565152 is an equidigital number, since it uses as much as digits as its factorization.

251565152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7861421 (or 7861413 counting only the distinct ones).

The product of its digits is 15000, while the sum is 32.

The square root of 251565152 is about 15860.8055280935. The cubic root of 251565152 is about 631.2724362577.

The spelling of 251565152 in words is "two hundred fifty-one million, five hundred sixty-five thousand, one hundred fifty-two".