391379101856 has 12 divisors (see below), whose sum is σ = 770527606842. Its totient is φ = 195689550912.

The previous prime is 391379101787. The next prime is 391379101933. The reversal of 391379101856 is 658101973193.

It can be written as a sum of positive squares in only one way, i.e., 365613715600 + 25765386256 = 604660^2 + 160516^2 .

It is a super-3 number, since 3×391379101856³ (a number of 36 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 391379101798 and 391379101807.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6115298435 + ... + 6115298498.

Almost surely, 2^391379101856 is an apocalyptic number.

It is an amenable number.

391379101856 is a deficient number, since it is larger than the sum of its proper divisors (379148504986).

391379101856 is a wasteful number, since it uses less digits than its factorization.

391379101856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12230596943 (or 12230596935 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 53.

The spelling of 391379101856 in words is "three hundred ninety-one billion, three hundred seventy-nine million, one hundred one thousand, eight hundred fifty-six".