1312457149 has 2 divisors, whose sum is σ = 1312457150. Its totient is φ = 1312457148.

The previous prime is 1312457141. The next prime is 1312457173. The reversal of 1312457149 is 9417542131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 999697924 + 312759225 = 31618^2 + 17685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312457149 - 2³ = 1312457141 is a prime.

It is a super-2 number, since 2×1312457149² = 3445087535922416402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312457141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656228574 + 656228575.

It is an arithmetic number, because the mean of its divisors is an integer number (656228575).

Almost surely, 2^1312457149 is an apocalyptic number.

It is an amenable number.

1312457149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312457149 is an equidigital number, since it uses as much as digits as its factorization.

1312457149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 1312457149 is about 36227.8504606608. The cubic root of 1312457149 is about 1094.8678694915.

The spelling of 1312457149 in words is "one billion, three hundred twelve million, four hundred fifty-seven thousand, one hundred forty-nine".