1312997747 has 2 divisors, whose sum is σ = 1312997748. Its totient is φ = 1312997746.

The previous prime is 1312997713. The next prime is 1312997761. The reversal of 1312997747 is 7477992131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1312997747 - 2²⁴ = 1296220531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312997695 and 1312997704.

It is not a weakly prime, because it can be changed into another prime (1312997767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656498873 + 656498874.

It is an arithmetic number, because the mean of its divisors is an integer number (656498874).

Almost surely, 2^1312997747 is an apocalyptic number.

1312997747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312997747 is an equidigital number, since it uses as much as digits as its factorization.

1312997747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 666792, while the sum is 50.

The square root of 1312997747 is about 36235.3107755405. The cubic root of 1312997747 is about 1095.0181733534.

The spelling of 1312997747 in words is "one billion, three hundred twelve million, nine hundred ninety-seven thousand, seven hundred forty-seven".