671022161 has 2 divisors, whose sum is σ = 671022162. Its totient is φ = 671022160.

The previous prime is 671022139. The next prime is 671022167. The reversal of 671022161 is 161220176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 489958225 + 181063936 = 22135^2 + 13456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671022161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 671022161.

It is not a weakly prime, because it can be changed into another prime (671022167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335511080 + 335511081.

It is an arithmetic number, because the mean of its divisors is an integer number (335511081).

Almost surely, 2^671022161 is an apocalyptic number.

It is an amenable number.

671022161 is a deficient number, since it is larger than the sum of its proper divisors (1).

671022161 is an equidigital number, since it uses as much as digits as its factorization.

671022161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 671022161 is about 25904.0954484035. The cubic root of 671022161 is about 875.4787740629.

The spelling of 671022161 in words is "six hundred seventy-one million, twenty-two thousand, one hundred sixty-one".