391201022131 has 4 divisors (see below), whose sum is σ = 391374814264. Its totient is φ = 391027230000.

The previous prime is 391201022111. The next prime is 391201022137. The reversal of 391201022131 is 131220102193.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 391201022131 - 2⁵ = 391201022099 is a prime.

It is a super-2 number, since 2×391201022131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 391201022096 and 391201022105.

It is not an unprimeable number, because it can be changed into a prime (391201022137) 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, 86892690 + ... + 86897191.

It is an arithmetic number, because the mean of its divisors is an integer number (97843703566).

Almost surely, 2^391201022131 is an apocalyptic number.

391201022131 is a deficient number, since it is larger than the sum of its proper divisors (173792133).

391201022131 is a wasteful number, since it uses less digits than its factorization.

391201022131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173792132.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 391201022131 in words is "three hundred ninety-one billion, two hundred one million, twenty-two thousand, one hundred thirty-one".