251513265 has 16 divisors (see below), whose sum is σ = 403860096. Its totient is φ = 133660800.

The previous prime is 251513239. The next prime is 251513291. The reversal of 251513265 is 562315152.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (251513239) and next prime (251513291).

It is not a de Polignac number, because 251513265 - 2⁹ = 251512753 is a prime.

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, 25621 + ... + 34050.

It is an arithmetic number, because the mean of its divisors is an integer number (25241256).

Almost surely, 2^251513265 is an apocalyptic number.

It is an amenable number.

251513265 is a deficient number, since it is larger than the sum of its proper divisors (152346831).

251513265 is a wasteful number, since it uses less digits than its factorization.

251513265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59960.

The product of its digits is 9000, while the sum is 30.

The square root of 251513265 is about 15859.1697449772. The cubic root of 251513265 is about 631.2290318820.

The spelling of 251513265 in words is "two hundred fifty-one million, five hundred thirteen thousand, two hundred sixty-five".