1312872749 has 2 divisors, whose sum is σ = 1312872750. Its totient is φ = 1312872748.

The previous prime is 1312872721. The next prime is 1312872763. The reversal of 1312872749 is 9472782131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 778800649 + 534072100 = 27907^2 + 23110^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312872749 - 2¹² = 1312868653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312872049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656436374 + 656436375.

It is an arithmetic number, because the mean of its divisors is an integer number (656436375).

Almost surely, 2^1312872749 is an apocalyptic number.

It is an amenable number.

1312872749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312872749 is an equidigital number, since it uses as much as digits as its factorization.

1312872749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 44.

The square root of 1312872749 is about 36233.5859252158. The cubic root of 1312872749 is about 1094.9834235031.

The spelling of 1312872749 in words is "one billion, three hundred twelve million, eight hundred seventy-two thousand, seven hundred forty-nine".