856517231 has 8 divisors (see below), whose sum is σ = 860836704. Its totient is φ = 852207840.

The previous prime is 856517201. The next prime is 856517243. The reversal of 856517231 is 132715658.

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

It is a cyclic number.

It is not a de Polignac number, because 856517231 - 2¹⁰ = 856516207 is a prime.

It is a super-2 number, since 2×856517231² = 1467243533999814722, 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 (856517201) 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, 211001 + ... + 215021.

It is an arithmetic number, because the mean of its divisors is an integer number (107604588).

Almost surely, 2^856517231 is an apocalyptic number.

856517231 is a deficient number, since it is larger than the sum of its proper divisors (4319473).

856517231 is a wasteful number, since it uses less digits than its factorization.

856517231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041.

The product of its digits is 50400, while the sum is 38.

The square root of 856517231 is about 29266.3156376063. The cubic root of 856517231 is about 949.6830821003.

The spelling of 856517231 in words is "eight hundred fifty-six million, five hundred seventeen thousand, two hundred thirty-one".