2131213631 has 2 divisors, whose sum is σ = 2131213632. Its totient is φ = 2131213630.

The previous prime is 2131213627. The next prime is 2131213663. The reversal of 2131213631 is 1363121312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2131213631 - 2² = 2131213627 is a prime.

It is a super-2 number, since 2×2131213631² = 9084143081920408322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2131213597 and 2131213606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131213621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065606815 + 1065606816.

It is an arithmetic number, because the mean of its divisors is an integer number (1065606816).

Almost surely, 2^2131213631 is an apocalyptic number.

2131213631 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131213631 is an equidigital number, since it uses as much as digits as its factorization.

2131213631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 23.

The square root of 2131213631 is about 46165.0693815140. The cubic root of 2131213631 is about 1286.8926735783.

Adding to 2131213631 its reverse (1363121312), we get a palindrome (3494334943).

It can be divided in two parts, 21312 and 13631, that added together give a palindrome (34943).

The spelling of 2131213631 in words is "two billion, one hundred thirty-one million, two hundred thirteen thousand, six hundred thirty-one".