391131670393 has 4 divisors (see below), whose sum is σ = 391355559760. Its totient is φ = 390907781028.

The previous prime is 391131670343. The next prime is 391131670409. The reversal of 391131670393 is 393076131193.

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, and also an emirpimes, since its reverse is a distinct semiprime: 393076131193 = 2791 ⋅140837023.

It is a cyclic number.

It is not a de Polignac number, because 391131670393 - 2³³ = 382541735801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391131670343) 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, 111942063 + ... + 111945556.

It is an arithmetic number, because the mean of its divisors is an integer number (97838889940).

Almost surely, 2^391131670393 is an apocalyptic number.

It is an amenable number.

391131670393 is a deficient number, since it is larger than the sum of its proper divisors (223889367).

391131670393 is a wasteful number, since it uses less digits than its factorization.

391131670393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223889366.

The product of its (nonzero) digits is 275562, while the sum is 46.

The spelling of 391131670393 in words is "three hundred ninety-one billion, one hundred thirty-one million, six hundred seventy thousand, three hundred ninety-three".