2131631 has 4 divisors (see below), whose sum is σ = 2183664. Its totient is φ = 2079600.

The previous prime is 2131627. The next prime is 2131651. The reversal of 2131631 is 1361312.

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 2131631 - 2² = 2131627 is a prime.

It is a super-2 number, since 2×2131631² = 9087701440322, 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 (2131601) 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, 25955 + ... + 26036.

It is an arithmetic number, because the mean of its divisors is an integer number (545916).

2^2131631 is an apocalyptic number.

2131631 is a deficient number, since it is larger than the sum of its proper divisors (52033).

2131631 is an equidigital number, since it uses as much as digits as its factorization.

2131631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52032.

The product of its digits is 108, while the sum is 17.

The square root of 2131631 is about 1460.0106163998. The cubic root of 2131631 is about 128.6976674863.

Adding to 2131631 its reverse (1361312), we get a palindrome (3492943).

The spelling of 2131631 in words is "two million, one hundred thirty-one thousand, six hundred thirty-one".