1231314257 has 2 divisors, whose sum is σ = 1231314258. Its totient is φ = 1231314256.

The previous prime is 1231314241. The next prime is 1231314281. The reversal of 1231314257 is 7524131321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1204853521 + 26460736 = 34711^2 + 5144^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231314257 - 2⁴ = 1231314241 is a prime.

It is a super-2 number, since 2×1231314257² = 3032269598982924098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1231314757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615657128 + 615657129.

It is an arithmetic number, because the mean of its divisors is an integer number (615657129).

Almost surely, 2^1231314257 is an apocalyptic number.

It is an amenable number.

1231314257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231314257 is an equidigital number, since it uses as much as digits as its factorization.

1231314257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 1231314257 is about 35090.0877314378. The cubic root of 1231314257 is about 1071.8227460999.

Adding to 1231314257 its reverse (7524131321), we get a palindrome (8755445578).

The spelling of 1231314257 in words is "one billion, two hundred thirty-one million, three hundred fourteen thousand, two hundred fifty-seven".