2131020431 has 4 divisors (see below), whose sum is σ = 2256374592. Its totient is φ = 2005666272.

The previous prime is 2131020413. The next prime is 2131020433. The reversal of 2131020431 is 1340201312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131020431 is a prime.

It is a super-2 number, since 2×2131020431² = 9082496154678851522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 125354143 = 2131020431 / (2 + 1 + 3 + 1 + 0 + 2 + 0 + 4 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131020433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62677055 + ... + 62677088.

It is an arithmetic number, because the mean of its divisors is an integer number (564093648).

Almost surely, 2^2131020431 is an apocalyptic number.

2131020431 is a deficient number, since it is larger than the sum of its proper divisors (125354161).

2131020431 is a wasteful number, since it uses less digits than its factorization.

2131020431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125354160.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2131020431 is about 46162.9768429203. The cubic root of 2131020431 is about 1286.8537856923.

Adding to 2131020431 its reverse (1340201312), we get a palindrome (3471221743).

The spelling of 2131020431 in words is "two billion, one hundred thirty-one million, twenty thousand, four hundred thirty-one".