3931631 has 4 divisors (see below), whose sum is σ = 4289064. Its totient is φ = 3574200.

The previous prime is 3931589. The next prime is 3931639. The reversal of 3931631 is 1361393.

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

It is a cyclic number.

It is not a de Polignac number, because 3931631 - 2⁶ = 3931567 is a prime.

It is a super-2 number, since 2×3931631² = 30915444640322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3931631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3931639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178700 + ... + 178721.

It is an arithmetic number, because the mean of its divisors is an integer number (1072266).

Almost surely, 2^3931631 is an apocalyptic number.

3931631 is a deficient number, since it is larger than the sum of its proper divisors (357433).

3931631 is a wasteful number, since it uses less digits than its factorization.

3931631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357432.

The product of its digits is 1458, while the sum is 26.

The square root of 3931631 is about 1982.8340828219. The cubic root of 3931631 is about 157.8304943897.

The spelling of 3931631 in words is "three million, nine hundred thirty-one thousand, six hundred thirty-one".