2131431131 has 4 divisors (see below), whose sum is σ = 2132691792. Its totient is φ = 2130170472.

The previous prime is 2131431097. The next prime is 2131431157. The reversal of 2131431131 is 1311341312.

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 2131431131 - 2¹⁰ = 2131430107 is a prime.

It is a super-2 number, since 2×2131431131² = 9085997332391878322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131431031) 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, 627791 + ... + 631176.

It is an arithmetic number, because the mean of its divisors is an integer number (533172948).

Almost surely, 2^2131431131 is an apocalyptic number.

2131431131 is a deficient number, since it is larger than the sum of its proper divisors (1260661).

2131431131 is a wasteful number, since it uses less digits than its factorization.

2131431131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260660.

The product of its digits is 216, while the sum is 20.

The square root of 2131431131 is about 46167.4249985853. The cubic root of 2131431131 is about 1286.9364498303.

Adding to 2131431131 its reverse (1311341312), we get a palindrome (3442772443).

The spelling of 2131431131 in words is "two billion, one hundred thirty-one million, four hundred thirty-one thousand, one hundred thirty-one".