13891931 has 16 divisors (see below), whose sum is σ = 15095808. Its totient is φ = 12751200.

The previous prime is 13891903. The next prime is 13891949. The reversal of 13891931 is 13919831.

It is not a de Polignac number, because 13891931 - 2¹⁰ = 13890907 is a prime.

It is a super-2 number, since 2×13891931² = 385971493817522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13891891 and 13891900.

It is not an unprimeable number, because it can be changed into a prime (13891901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76661 + ... + 76841.

It is an arithmetic number, because the mean of its divisors is an integer number (943488).

Almost surely, 2^13891931 is an apocalyptic number.

13891931 is a deficient number, since it is larger than the sum of its proper divisors (1203877).

13891931 is a wasteful number, since it uses less digits than its factorization.

13891931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322.

The product of its digits is 5832, while the sum is 35.

The square root of 13891931 is about 3727.1880821874. The cubic root of 13891931 is about 240.3924770372.

The spelling of 13891931 in words is "thirteen million, eight hundred ninety-one thousand, nine hundred thirty-one".