1297961265 has 16 divisors (see below), whose sum is σ = 2148350400. Its totient is φ = 668375232.

The previous prime is 1297961219. The next prime is 1297961303. The reversal of 1297961265 is 5621697921.

It is not a de Polignac number, because 1297961265 - 2⁹ = 1297960753 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1491475 + ... + 1492344.

It is an arithmetic number, because the mean of its divisors is an integer number (134271900).

Almost surely, 2^1297961265 is an apocalyptic number.

1297961265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1297961265 is a deficient number, since it is larger than the sum of its proper divisors (850389135).

1297961265 is a wasteful number, since it uses less digits than its factorization.

1297961265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2983856.

The product of its digits is 408240, while the sum is 48.

The square root of 1297961265 is about 36027.2294938148. The cubic root of 1297961265 is about 1090.8220561277.

The spelling of 1297961265 in words is "one billion, two hundred ninety-seven million, nine hundred sixty-one thousand, two hundred sixty-five".