856883281 has 4 divisors (see below), whose sum is σ = 857621232. Its totient is φ = 856145332.

The previous prime is 856883263. The next prime is 856883323. The reversal of 856883281 is 182388658.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856883281 is a prime.

It is a super-2 number, since 2×856883281² = 1468497914514649922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856883381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367231 + ... + 369556.

It is an arithmetic number, because the mean of its divisors is an integer number (214405308).

Almost surely, 2^856883281 is an apocalyptic number.

It is an amenable number.

856883281 is a deficient number, since it is larger than the sum of its proper divisors (737951).

856883281 is a wasteful number, since it uses less digits than its factorization.

856883281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737950.

The product of its digits is 737280, while the sum is 49.

The square root of 856883281 is about 29272.5687461828. The cubic root of 856883281 is about 949.8183516037.

The spelling of 856883281 in words is "eight hundred fifty-six million, eight hundred eighty-three thousand, two hundred eighty-one".