18210161 has 2 divisors, whose sum is σ = 18210162. Its totient is φ = 18210160.

The previous prime is 18210139. The next prime is 18210209. The reversal of 18210161 is 16101281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11022400 + 7187761 = 3320^2 + 2681^2 .

It is a cyclic number.

It is not a de Polignac number, because 18210161 - 2¹⁰ = 18209137 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18210061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9105080 + 9105081.

It is an arithmetic number, because the mean of its divisors is an integer number (9105081).

Almost surely, 2^18210161 is an apocalyptic number.

It is an amenable number.

18210161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18210161 is an equidigital number, since it uses as much as digits as its factorization.

18210161 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 18210161 is about 4267.3365229379. The cubic root of 18210161 is about 263.0901540019.

The spelling of 18210161 in words is "eighteen million, two hundred ten thousand, one hundred sixty-one".