1256320895 has 16 divisors (see below), whose sum is σ = 1545160320. Its totient is φ = 980083104.

The previous prime is 1256320883. The next prime is 1256320909. The reversal of 1256320895 is 5980236521.

It is a cyclic number.

It is not a de Polignac number, because 1256320895 - 2¹⁰ = 1256319871 is a prime.

It is a congruent number.

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, 137252 + ... + 146118.

It is an arithmetic number, because the mean of its divisors is an integer number (96572520).

Almost surely, 2^1256320895 is an apocalyptic number.

1256320895 is a deficient number, since it is larger than the sum of its proper divisors (288839425).

1256320895 is an equidigital number, since it uses as much as digits as its factorization.

1256320895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9574.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 1256320895 is about 35444.6172923337. The cubic root of 1256320895 is about 1079.0300204404.

The spelling of 1256320895 in words is "one billion, two hundred fifty-six million, three hundred twenty thousand, eight hundred ninety-five".