856493177 has 2 divisors, whose sum is σ = 856493178. Its totient is φ = 856493176.

The previous prime is 856493171. The next prime is 856493179. The reversal of 856493177 is 771394658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 791915881 + 64577296 = 28141^2 + 8036^2 .

It is a cyclic number.

It is not a de Polignac number, because 856493177 - 2⁴ = 856493161 is a prime.

Together with 856493179, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (856493171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428246588 + 428246589.

It is an arithmetic number, because the mean of its divisors is an integer number (428246589).

Almost surely, 2^856493177 is an apocalyptic number.

It is an amenable number.

856493177 is a deficient number, since it is larger than the sum of its proper divisors (1).

856493177 is an equidigital number, since it uses as much as digits as its factorization.

856493177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 50.

The square root of 856493177 is about 29265.9046844617. The cubic root of 856493177 is about 949.6741918761.

The spelling of 856493177 in words is "eight hundred fifty-six million, four hundred ninety-three thousand, one hundred seventy-seven".