1297856265 has 8 divisors (see below), whose sum is σ = 2076570048. Its totient is φ = 692190000.

The previous prime is 1297856257. The next prime is 1297856267. The reversal of 1297856265 is 5626587921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1297856265 - 2³ = 1297856257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1297856267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43261861 + ... + 43261890.

It is an arithmetic number, because the mean of its divisors is an integer number (259571256).

Almost surely, 2^1297856265 is an apocalyptic number.

1297856265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1297856265 is a deficient number, since it is larger than the sum of its proper divisors (778713783).

1297856265 is an equidigital number, since it uses as much as digits as its factorization.

1297856265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86523759.

The product of its digits is 1814400, while the sum is 51.

The square root of 1297856265 is about 36025.7722332221. The cubic root of 1297856265 is about 1090.7926409190.

The spelling of 1297856265 in words is "one billion, two hundred ninety-seven million, eight hundred fifty-six thousand, two hundred sixty-five".