391915980550057 has 4 divisors (see below), whose sum is σ = 391916982538576. Its totient is φ = 391914978561540.

The previous prime is 391915980550027. The next prime is 391915980550063. The reversal of 391915980550057 is 750055089519193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 391915980550057 - 2³⁹ = 391366224736169 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 391915980549974 and 391915980550001.

It is not an unprimeable number, because it can be changed into a prime (391915980550027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500407323 + ... + 501189904.

It is an arithmetic number, because the mean of its divisors is an integer number (97979245634644).

Almost surely, 2^{391915980550057} is an apocalyptic number.

It is an amenable number.

391915980550057 is a deficient number, since it is larger than the sum of its proper divisors (1001988519).

391915980550057 is a wasteful number, since it uses less digits than its factorization.

391915980550057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001988518.

The product of its (nonzero) digits is 76545000, while the sum is 67.

The spelling of 391915980550057 in words is "three hundred ninety-one trillion, nine hundred fifteen billion, nine hundred eighty million, five hundred fifty thousand, fifty-seven".