391982516325 has 60 divisors (see below), whose sum is σ = 729076048448. Its totient is φ = 209057079600.

The previous prime is 391982516291. The next prime is 391982516329. The reversal of 391982516325 is 523615289193.

391982516325 is a `hidden beast` number, since 3 + 9 + 1 + 98 + 2 + 516 + 32 + 5 = 666.

It is not a de Polignac number, because 391982516325 - 2⁷ = 391982516197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391982516329) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 93780 + ... + 890370.

Almost surely, 2^391982516325 is an apocalyptic number.

It is an amenable number.

391982516325 is a deficient number, since it is larger than the sum of its proper divisors (337093532123).

391982516325 is an frugal number, since it uses more digits than its factorization.

391982516325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796628 (or 796599 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The spelling of 391982516325 in words is "three hundred ninety-one billion, nine hundred eighty-two million, five hundred sixteen thousand, three hundred twenty-five".