856582879 has 2 divisors, whose sum is σ = 856582880. Its totient is φ = 856582878.

The previous prime is 856582823. The next prime is 856582891. The reversal of 856582879 is 978285658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856582879 - 2¹¹ = 856580831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856585879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428291439 + 428291440.

It is an arithmetic number, because the mean of its divisors is an integer number (428291440).

Almost surely, 2^856582879 is an apocalyptic number.

856582879 is a deficient number, since it is larger than the sum of its proper divisors (1).

856582879 is an equidigital number, since it uses as much as digits as its factorization.

856582879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9676800, while the sum is 58.

The square root of 856582879 is about 29267.4371785437. The cubic root of 856582879 is about 949.7073443879.

The spelling of 856582879 in words is "eight hundred fifty-six million, five hundred eighty-two thousand, eight hundred seventy-nine".