1231302131 has 2 divisors, whose sum is σ = 1231302132. Its totient is φ = 1231302130.

The previous prime is 1231302073. The next prime is 1231302133. The reversal of 1231302131 is 1312031321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231302131 is a prime.

It is a super-2 number, since 2×1231302131² = 3032209875610282322, which contains 22 as substring.

Together with 1231302133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1231302133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615651065 + 615651066.

It is an arithmetic number, because the mean of its divisors is an integer number (615651066).

Almost surely, 2^1231302131 is an apocalyptic number.

1231302131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231302131 is an equidigital number, since it uses as much as digits as its factorization.

1231302131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1231302131 is about 35089.9149471753. The cubic root of 1231302131 is about 1071.8192276466.

Adding to 1231302131 its reverse (1312031321), we get a palindrome (2543333452).

The spelling of 1231302131 in words is "one billion, two hundred thirty-one million, three hundred two thousand, one hundred thirty-one".