391118917139 has 8 divisors (see below), whose sum is σ = 392590721040. Its totient is φ = 389649628800.

The previous prime is 391118917129. The next prime is 391118917141. The reversal of 391118917139 is 931719811193.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 391118917139 - 2²⁸ = 390850481683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391118917109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317057 + ... + 939554.

It is an arithmetic number, because the mean of its divisors is an integer number (49073840130).

Almost surely, 2^391118917139 is an apocalyptic number.

391118917139 is a deficient number, since it is larger than the sum of its proper divisors (1471803901).

391118917139 is a wasteful number, since it uses less digits than its factorization.

391118917139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257781.

The product of its digits is 367416, while the sum is 53.

The spelling of 391118917139 in words is "three hundred ninety-one billion, one hundred eighteen million, nine hundred seventeen thousand, one hundred thirty-nine".