856081 has 2 divisors, whose sum is σ = 856082. Its totient is φ = 856080.

The previous prime is 856073. The next prime is 856099. The reversal of 856081 is 180658.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 625681 + 230400 = 791^2 + 480^2 .

It is a cyclic number.

It is not a de Polignac number, because 856081 - 2³ = 856073 is a prime.

It is a super-2 number, since 2×856081² = 1465749357122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (856021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428040 + 428041.

It is an arithmetic number, because the mean of its divisors is an integer number (428041).

2⁸⁵⁶⁰⁸¹ is an apocalyptic number.

It is an amenable number.

856081 is a deficient number, since it is larger than the sum of its proper divisors (1).

856081 is an equidigital number, since it uses as much as digits as its factorization.

856081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 856081 is about 925.2464536544. The cubic root of 856081 is about 94.9521827686.

The spelling of 856081 in words is "eight hundred fifty-six thousand, eighty-one".