856179161 has 2 divisors, whose sum is σ = 856179162. Its totient is φ = 856179160.

The previous prime is 856179101. The next prime is 856179187. The reversal of 856179161 is 161971658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 780140761 + 76038400 = 27931^2 + 8720^2 .

It is a cyclic number.

It is not a de Polignac number, because 856179161 - 2¹⁴ = 856162777 is a prime.

It is a super-3 number, since 3×856179161³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (856179101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428089580 + 428089581.

It is an arithmetic number, because the mean of its divisors is an integer number (428089581).

Almost surely, 2^856179161 is an apocalyptic number.

It is an amenable number.

856179161 is a deficient number, since it is larger than the sum of its proper divisors (1).

856179161 is an equidigital number, since it uses as much as digits as its factorization.

856179161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 44.

The square root of 856179161 is about 29260.5393149204. The cubic root of 856179161 is about 949.5581180411.

The spelling of 856179161 in words is "eight hundred fifty-six million, one hundred seventy-nine thousand, one hundred sixty-one".