1297343885 has 4 divisors (see below), whose sum is σ = 1556812668. Its totient is φ = 1037875104.

The previous prime is 1297343869. The next prime is 1297343891. The reversal of 1297343885 is 5883437921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1006539076 + 290804809 = 31726^2 + 17053^2 .

It is a cyclic number.

It is not a de Polignac number, because 1297343885 - 2⁴ = 1297343869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 129734384 + ... + 129734393.

It is an arithmetic number, because the mean of its divisors is an integer number (389203167).

Almost surely, 2^1297343885 is an apocalyptic number.

It is an amenable number.

1297343885 is a deficient number, since it is larger than the sum of its proper divisors (259468783).

1297343885 is an equidigital number, since it uses as much as digits as its factorization.

1297343885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259468782.

The product of its digits is 1451520, while the sum is 50.

The square root of 1297343885 is about 36018.6602332735. The cubic root of 1297343885 is about 1090.6490775384.

The spelling of 1297343885 in words is "one billion, two hundred ninety-seven million, three hundred forty-three thousand, eight hundred eighty-five".