2031131381 has 2 divisors, whose sum is σ = 2031131382. Its totient is φ = 2031131380.

The previous prime is 2031131363. The next prime is 2031131383. The reversal of 2031131381 is 1831311302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1337072356 + 694059025 = 36566^2 + 26345^2 .

It is a cyclic number.

It is not a de Polignac number, because 2031131381 - 2¹⁸ = 2030869237 is a prime.

It is a super-2 number, since 2×2031131381² = 8250989373765934322, which contains 22 as substring.

Together with 2031131383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2031131383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1015565690 + 1015565691.

It is an arithmetic number, because the mean of its divisors is an integer number (1015565691).

Almost surely, 2^2031131381 is an apocalyptic number.

It is an amenable number.

2031131381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2031131381 is an equidigital number, since it uses as much as digits as its factorization.

2031131381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 2031131381 is about 45068.0749644357. The cubic root of 2031131381 is about 1266.4246019968.

Adding to 2031131381 its reverse (1831311302), we get a palindrome (3862442683).

The spelling of 2031131381 in words is "two billion, thirty-one million, one hundred thirty-one thousand, three hundred eighty-one".