856825231 has 16 divisors (see below), whose sum is σ = 885980160. Its totient is φ = 828303840.

The previous prime is 856825219. The next prime is 856825253. The reversal of 856825231 is 132528658.

856825231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 856825231 - 2⁹ = 856824719 is a prime.

It is a super-2 number, since 2×856825231² = 1468298952956406722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856825201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 969916 + ... + 970798.

It is an arithmetic number, because the mean of its divisors is an integer number (55373760).

Almost surely, 2^856825231 is an apocalyptic number.

856825231 is a deficient number, since it is larger than the sum of its proper divisors (29154929).

856825231 is a wasteful number, since it uses less digits than its factorization.

856825231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206.

The product of its digits is 115200, while the sum is 40.

The square root of 856825231 is about 29271.5771867523. The cubic root of 856825231 is about 949.7969024746.

The spelling of 856825231 in words is "eight hundred fifty-six million, eight hundred twenty-five thousand, two hundred thirty-one".