391044804225 has 12 divisors (see below), whose sum is σ = 646527409776. Its totient is φ = 208557228880.

The previous prime is 391044804217. The next prime is 391044804251. The reversal of 391044804225 is 522408440193.

It is a happy number.

It is not a de Polignac number, because 391044804225 - 2³ = 391044804217 is a prime.

It is a super-2 number, since 2×391044804225² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2606965287 + ... + 2606965436.

It is an arithmetic number, because the mean of its divisors is an integer number (53877284148).

Almost surely, 2^391044804225 is an apocalyptic number.

It is an amenable number.

391044804225 is a deficient number, since it is larger than the sum of its proper divisors (255482605551).

391044804225 is a wasteful number, since it uses less digits than its factorization.

391044804225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5213930736 (or 5213930731 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 391044804225 in words is "three hundred ninety-one billion, forty-four million, eight hundred four thousand, two hundred twenty-five".