856031213 has 2 divisors, whose sum is σ = 856031214. Its totient is φ = 856031212.

The previous prime is 856031201. The next prime is 856031219. The reversal of 856031213 is 312130658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624900004 + 231131209 = 24998^2 + 15203^2 .

It is a cyclic number.

It is not a de Polignac number, because 856031213 - 2²⁰ = 854982637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856031219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428015606 + 428015607.

It is an arithmetic number, because the mean of its divisors is an integer number (428015607).

Almost surely, 2^856031213 is an apocalyptic number.

It is an amenable number.

856031213 is a deficient number, since it is larger than the sum of its proper divisors (1).

856031213 is an equidigital number, since it uses as much as digits as its factorization.

856031213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 856031213 is about 29258.0110909816. The cubic root of 856031213 is about 949.5034202537.

The spelling of 856031213 in words is "eight hundred fifty-six million, thirty-one thousand, two hundred thirteen".