1297791449 has 2 divisors, whose sum is σ = 1297791450. Its totient is φ = 1297791448.

The previous prime is 1297791433. The next prime is 1297791457. The reversal of 1297791449 is 9441977921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1139535049 + 158256400 = 33757^2 + 12580^2 .

It is a cyclic number.

It is not a de Polignac number, because 1297791449 - 2⁴ = 1297791433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1297791449.

It is not a weakly prime, because it can be changed into another prime (1297791419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648895724 + 648895725.

It is an arithmetic number, because the mean of its divisors is an integer number (648895725).

Almost surely, 2^1297791449 is an apocalyptic number.

It is an amenable number.

1297791449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297791449 is an equidigital number, since it uses as much as digits as its factorization.

1297791449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 53.

The square root of 1297791449 is about 36024.8726437721. The cubic root of 1297791449 is about 1090.7744822588.

The spelling of 1297791449 in words is "one billion, two hundred ninety-seven million, seven hundred ninety-one thousand, four hundred forty-nine".