210081161 has 2 divisors, whose sum is σ = 210081162. Its totient is φ = 210081160.

The previous prime is 210081139. The next prime is 210081173. The reversal of 210081161 is 161180012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208629136 + 1452025 = 14444^2 + 1205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210081161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (210081181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105040580 + 105040581.

It is an arithmetic number, because the mean of its divisors is an integer number (105040581).

Almost surely, 2^210081161 is an apocalyptic number.

It is an amenable number.

210081161 is a deficient number, since it is larger than the sum of its proper divisors (1).

210081161 is an equidigital number, since it uses as much as digits as its factorization.

210081161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 210081161 is about 14494.1767962172. The cubic root of 210081161 is about 594.4687591676.

The spelling of 210081161 in words is "two hundred ten million, eighty-one thousand, one hundred sixty-one".