3931913 has 4 divisors (see below), whose sum is σ = 4163220. Its totient is φ = 3700608.

The previous prime is 3931891. The next prime is 3931927. The reversal of 3931913 is 3191393.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1776889 + 2155024 = 1333^2 + 1468^2 .

It is a cyclic number.

It is not a de Polignac number, because 3931913 - 2¹⁸ = 3669769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3931933) 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, 115628 + ... + 115661.

It is an arithmetic number, because the mean of its divisors is an integer number (1040805).

Almost surely, 2^3931913 is an apocalyptic number.

It is an amenable number.

3931913 is a deficient number, since it is larger than the sum of its proper divisors (231307).

3931913 is a wasteful number, since it uses less digits than its factorization.

3931913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231306.

The product of its digits is 2187, while the sum is 29.

The square root of 3931913 is about 1982.9051918839. The cubic root of 3931913 is about 157.8342678139.

The spelling of 3931913 in words is "three million, nine hundred thirty-one thousand, nine hundred thirteen".