391149695321 has 32 divisors (see below), whose sum is σ = 498165534720. Its totient is φ = 298233676800.

The previous prime is 391149695309. The next prime is 391149695357. The reversal of 391149695321 is 123596941193.

It is a cyclic number.

It is not a de Polignac number, because 391149695321 - 2¹⁸ = 391149433177 is a prime.

It is a super-2 number, since 2×391149695321² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (391149695621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18124025 + ... + 18145593.

It is an arithmetic number, because the mean of its divisors is an integer number (15567672960).

Almost surely, 2^391149695321 is an apocalyptic number.

It is an amenable number.

391149695321 is a deficient number, since it is larger than the sum of its proper divisors (107015839399).

391149695321 is a wasteful number, since it uses less digits than its factorization.

391149695321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26645.

The product of its digits is 1574640, while the sum is 53.

The spelling of 391149695321 in words is "three hundred ninety-one billion, one hundred forty-nine million, six hundred ninety-five thousand, three hundred twenty-one".