856971121331 has 8 divisors (see below), whose sum is σ = 923087198880. Its totient is φ = 790882932672.

The previous prime is 856971121297. The next prime is 856971121339. The reversal of 856971121331 is 133121179658.

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 856971121331 - 2²² = 856966927027 is a prime.

It is a super-2 number, since 2×856971121331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856971121339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6908375 + ... + 7031328.

It is an arithmetic number, because the mean of its divisors is an integer number (115385899860).

Almost surely, 2^856971121331 is an apocalyptic number.

856971121331 is a deficient number, since it is larger than the sum of its proper divisors (66116077549).

856971121331 is a wasteful number, since it uses less digits than its factorization.

856971121331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13944445.

The product of its digits is 272160, while the sum is 47.

The spelling of 856971121331 in words is "eight hundred fifty-six billion, nine hundred seventy-one million, one hundred twenty-one thousand, three hundred thirty-one".