856283921 has 2 divisors, whose sum is σ = 856283922. Its totient is φ = 856283920.

The previous prime is 856283881. The next prime is 856283969. The reversal of 856283921 is 129382658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 754051600 + 102232321 = 27460^2 + 10111^2 .

It is a cyclic number.

It is not a de Polignac number, because 856283921 - 2¹⁴ = 856267537 is a prime.

It is not a weakly prime, because it can be changed into another prime (856285921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428141960 + 428141961.

It is an arithmetic number, because the mean of its divisors is an integer number (428141961).

Almost surely, 2^856283921 is an apocalyptic number.

It is an amenable number.

856283921 is a deficient number, since it is larger than the sum of its proper divisors (1).

856283921 is an equidigital number, since it uses as much as digits as its factorization.

856283921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 856283921 is about 29262.3293843809. The cubic root of 856283921 is about 949.5968450023.

The spelling of 856283921 in words is "eight hundred fifty-six million, two hundred eighty-three thousand, nine hundred twenty-one".