856152191 has 4 divisors (see below), whose sum is σ = 856285584. Its totient is φ = 856018800.

The previous prime is 856152173. The next prime is 856152229. The reversal of 856152191 is 191251658.

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 856152191 - 2²⁶ = 789043327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856152091) 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, 56555 + ... + 70076.

It is an arithmetic number, because the mean of its divisors is an integer number (214071396).

Almost surely, 2^856152191 is an apocalyptic number.

856152191 is a deficient number, since it is larger than the sum of its proper divisors (133393).

856152191 is a wasteful number, since it uses less digits than its factorization.

856152191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133392.

The product of its digits is 21600, while the sum is 38.

The square root of 856152191 is about 29260.0784517062. The cubic root of 856152191 is about 949.5481474444.

The spelling of 856152191 in words is "eight hundred fifty-six million, one hundred fifty-two thousand, one hundred ninety-one".