856596091 has 4 divisors (see below), whose sum is σ = 922488112. Its totient is φ = 790704072.

The previous prime is 856596079. The next prime is 856596121. The reversal of 856596091 is 190695658.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 856596091 - 2⁷ = 856595963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (856596001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32945991 + ... + 32946016.

It is an arithmetic number, because the mean of its divisors is an integer number (230622028).

Almost surely, 2^856596091 is an apocalyptic number.

856596091 is a deficient number, since it is larger than the sum of its proper divisors (65892021).

856596091 is a wasteful number, since it uses less digits than its factorization.

856596091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65892020.

The product of its (nonzero) digits is 583200, while the sum is 49.

The square root of 856596091 is about 29267.6628892708. The cubic root of 856596091 is about 949.7122271491.

The spelling of 856596091 in words is "eight hundred fifty-six million, five hundred ninety-six thousand, ninety-one".