2131402331 has 4 divisors (see below), whose sum is σ = 2138934072. Its totient is φ = 2123870592.

The previous prime is 2131402309. The next prime is 2131402391. The reversal of 2131402331 is 1332041312.

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 2131402331 - 2⁶ = 2131402267 is a prime.

It is a super-2 number, since 2×2131402331² = 9085751793184467122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131402391) 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, 3765446 + ... + 3766011.

It is an arithmetic number, because the mean of its divisors is an integer number (534733518).

Almost surely, 2^2131402331 is an apocalyptic number.

2131402331 is a deficient number, since it is larger than the sum of its proper divisors (7531741).

2131402331 is an equidigital number, since it uses as much as digits as its factorization.

2131402331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7531740.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 2131402331 is about 46167.1130892977. The cubic root of 2131402331 is about 1286.9306534218.

Adding to 2131402331 its reverse (1332041312), we get a palindrome (3463443643).

The spelling of 2131402331 in words is "two billion, one hundred thirty-one million, four hundred two thousand, three hundred thirty-one".