1297362491 has 2 divisors, whose sum is σ = 1297362492. Its totient is φ = 1297362490.

The previous prime is 1297362433. The next prime is 1297362511. The reversal of 1297362491 is 1942637921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1297362491 - 2¹⁰ = 1297361467 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1297362421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648681245 + 648681246.

It is an arithmetic number, because the mean of its divisors is an integer number (648681246).

Almost surely, 2^1297362491 is an apocalyptic number.

1297362491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297362491 is an equidigital number, since it uses as much as digits as its factorization.

1297362491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 44.

The square root of 1297362491 is about 36018.9185151359. The cubic root of 1297362491 is about 1090.6542914014.

The spelling of 1297362491 in words is "one billion, two hundred ninety-seven million, three hundred sixty-two thousand, four hundred ninety-one".