1231253137 has 2 divisors, whose sum is σ = 1231253138. Its totient is φ = 1231253136.

The previous prime is 1231253119. The next prime is 1231253159. The reversal of 1231253137 is 7313521321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1147786641 + 83466496 = 33879^2 + 9136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231253137 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231253167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615626568 + 615626569.

It is an arithmetic number, because the mean of its divisors is an integer number (615626569).

Almost surely, 2^1231253137 is an apocalyptic number.

It is an amenable number.

1231253137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231253137 is an equidigital number, since it uses as much as digits as its factorization.

1231253137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 28.

The square root of 1231253137 is about 35089.2168194162. The cubic root of 1231253137 is about 1071.8050114207.

Adding to 1231253137 its reverse (7313521321), we get a palindrome (8544774458).

The spelling of 1231253137 in words is "one billion, two hundred thirty-one million, two hundred fifty-three thousand, one hundred thirty-seven".