391251265 has 16 divisors (see below), whose sum is σ = 480287232. Its totient is φ = 305833024.

The previous prime is 391251241. The next prime is 391251269. The reversal of 391251265 is 562152193.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391251265 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 391251265.

It is not an unprimeable number, because it can be changed into a prime (391251269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207507 + ... + 209383.

It is an arithmetic number, because the mean of its divisors is an integer number (30017952).

Almost surely, 2^391251265 is an apocalyptic number.

It is an amenable number.

391251265 is a deficient number, since it is larger than the sum of its proper divisors (89035967).

391251265 is a wasteful number, since it uses less digits than its factorization.

391251265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816.

The product of its digits is 16200, while the sum is 34.

The square root of 391251265 is about 19780.0724215054. The cubic root of 391251265 is about 731.3948840929.

The spelling of 391251265 in words is "three hundred ninety-one million, two hundred fifty-one thousand, two hundred sixty-five".