391939854601 has 3 divisors (see below), whose sum is σ = 391940480653. Its totient is φ = 391939228550.

The previous prime is 391939854563. The next prime is 391939854613. The reversal of 391939854601 is 106458939193.

It is a happy number.

The square root of 391939854601 is 626051.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 391939854601 - 2⁷ = 391939854473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391939854671) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 313026 + ... + 939076.

Almost surely, 2^391939854601 is an apocalyptic number.

391939854601 is the 626051-st square number.

391939854601 is the 313026-th centered octagonal number.

It is an amenable number.

391939854601 is a deficient number, since it is larger than the sum of its proper divisors (626052).

391939854601 is an frugal number, since it uses more digits than its factorization.

391939854601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252102 (or 626051 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 58.

The spelling of 391939854601 in words is "three hundred ninety-one billion, nine hundred thirty-nine million, eight hundred fifty-four thousand, six hundred one".