1297499969 has 2 divisors, whose sum is σ = 1297499970. Its totient is φ = 1297499968.

The previous prime is 1297499953. The next prime is 1297500023. The reversal of 1297499969 is 9699947921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1103036944 + 194463025 = 33212^2 + 13945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1297499969 - 2⁴ = 1297499953 is a prime.

It is a super-2 number, since 2×1297499969² = 3367012339110001922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1297499909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648749984 + 648749985.

It is an arithmetic number, because the mean of its divisors is an integer number (648749985).

Almost surely, 2^1297499969 is an apocalyptic number.

It is an amenable number.

1297499969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297499969 is an equidigital number, since it uses as much as digits as its factorization.

1297499969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19840464, while the sum is 65.

The square root of 1297499969 is about 36020.8268783491. The cubic root of 1297499969 is about 1090.6928146041.

The spelling of 1297499969 in words is "one billion, two hundred ninety-seven million, four hundred ninety-nine thousand, nine hundred sixty-nine".