856222531 has 2 divisors, whose sum is σ = 856222532. Its totient is φ = 856222530.

The previous prime is 856222469. The next prime is 856222553. The reversal of 856222531 is 135222658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856222531 - 2¹¹ = 856220483 is a prime.

It is a super-2 number, since 2×856222531² = 1466234045184091922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (856222571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428111265 + 428111266.

It is an arithmetic number, because the mean of its divisors is an integer number (428111266).

Almost surely, 2^856222531 is an apocalyptic number.

856222531 is a deficient number, since it is larger than the sum of its proper divisors (1).

856222531 is an equidigital number, since it uses as much as digits as its factorization.

856222531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 34.

The square root of 856222531 is about 29261.2804060246. The cubic root of 856222531 is about 949.5741511496.

The spelling of 856222531 in words is "eight hundred fifty-six million, two hundred twenty-two thousand, five hundred thirty-one".