13906859931 has 6 divisors (see below), whose sum is σ = 20087686580. Its totient is φ = 9271239948.

The previous prime is 13906859927. The next prime is 13906859947. The reversal of 13906859931 is 13995860931.

13906859931 is a `hidden beast` number, since 13 + 9 + 0 + 6 + 8 + 599 + 31 = 666.

It is not a de Polignac number, because 13906859931 - 2² = 13906859927 is a prime.

It is a super-2 number, since 2×13906859931² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13906859731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 772603321 + ... + 772603338.

Almost surely, 2^13906859931 is an apocalyptic number.

13906859931 is a deficient number, since it is larger than the sum of its proper divisors (6180826649).

13906859931 is a wasteful number, since it uses less digits than its factorization.

13906859931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545206665 (or 1545206662 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The spelling of 13906859931 in words is "thirteen billion, nine hundred six million, eight hundred fifty-nine thousand, nine hundred thirty-one".