856830081 has 4 divisors (see below), whose sum is σ = 1142440112. Its totient is φ = 571220052.

The previous prime is 856830047. The next prime is 856830089. The reversal of 856830081 is 180038658.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 856830081 - 2²⁹ = 319959169 is a prime.

It is a super-2 number, since 2×856830081² = 1468315575412933122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856830089) 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, 142805011 + ... + 142805016.

It is an arithmetic number, because the mean of its divisors is an integer number (285610028).

Almost surely, 2^856830081 is an apocalyptic number.

It is an amenable number.

856830081 is a deficient number, since it is larger than the sum of its proper divisors (285610031).

856830081 is a wasteful number, since it uses less digits than its factorization.

856830081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285610030.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 856830081 is about 29271.6600315049. The cubic root of 856830081 is about 949.7986945577.

The spelling of 856830081 in words is "eight hundred fifty-six million, eight hundred thirty thousand, eighty-one".