856408081 has 8 divisors (see below), whose sum is σ = 878527584. Its totient is φ = 834388800.

The previous prime is 856408067. The next prime is 856408171. The reversal of 856408081 is 180804658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856408081 - 2¹³ = 856399889 is a prime.

It is a super-2 number, since 2×856408081² = 1466869602404205122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856408001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7591 + ... + 42076.

It is an arithmetic number, because the mean of its divisors is an integer number (109815948).

Almost surely, 2^856408081 is an apocalyptic number.

It is an amenable number.

856408081 is a deficient number, since it is larger than the sum of its proper divisors (22119503).

856408081 is a wasteful number, since it uses less digits than its factorization.

856408081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50111.

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 856408081 is about 29264.4508063965. The cubic root of 856408081 is about 949.6427395330.

The spelling of 856408081 in words is "eight hundred fifty-six million, four hundred eight thousand, eighty-one".