1256552857 has 16 divisors (see below), whose sum is σ = 1444060800. Its totient is φ = 1071066240.

The previous prime is 1256552839. The next prime is 1256552867. The reversal of 1256552857 is 7582556521.

It is a cyclic number.

It is not a de Polignac number, because 1256552857 - 2¹¹ = 1256550809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1256552827) 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 15 ways as a sum of consecutive naturals, for example, 1548982 + ... + 1549792.

It is an arithmetic number, because the mean of its divisors is an integer number (90253800).

Almost surely, 2^1256552857 is an apocalyptic number.

It is an amenable number.

1256552857 is a deficient number, since it is larger than the sum of its proper divisors (187507943).

1256552857 is an equidigital number, since it uses as much as digits as its factorization.

1256552857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776.

The product of its digits is 840000, while the sum is 46.

The square root of 1256552857 is about 35447.8893165729. The cubic root of 1256552857 is about 1079.0964255974.

The spelling of 1256552857 in words is "one billion, two hundred fifty-six million, five hundred fifty-two thousand, eight hundred fifty-seven".