3131631 has 6 divisors (see below), whose sum is σ = 4523480. Its totient is φ = 2087748.

The previous prime is 3131629. The next prime is 3131641. The reversal of 3131631 is 1361313.

3131631 is a `hidden beast` number, since 3 + 1 + 31 + 631 = 666.

It is not a de Polignac number, because 3131631 - 2¹ = 3131629 is a prime.

It is a super-2 number, since 2×3131631² = 19614225440322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131641) 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, 173971 + ... + 173988.

Almost surely, 2^3131631 is an apocalyptic number.

3131631 is a deficient number, since it is larger than the sum of its proper divisors (1391849).

3131631 is a wasteful number, since it uses less digits than its factorization.

3131631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347965 (or 347962 counting only the distinct ones).

The product of its digits is 162, while the sum is 18.

The square root of 3131631 is about 1769.6414891158. The cubic root of 3131631 is about 146.3042227170.

Adding to 3131631 its reverse (1361313), we get a palindrome (4492944).

The spelling of 3131631 in words is "three million, one hundred thirty-one thousand, six hundred thirty-one".