18702161 has 2 divisors, whose sum is σ = 18702162. Its totient is φ = 18702160.

The previous prime is 18702143. The next prime is 18702169. The reversal of 18702161 is 16120781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18653761 + 48400 = 4319^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 18702161 - 2⁶ = 18702097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18702161.

It is not a weakly prime, because it can be changed into another prime (18702169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9351080 + 9351081.

It is an arithmetic number, because the mean of its divisors is an integer number (9351081).

Almost surely, 2^18702161 is an apocalyptic number.

It is an amenable number.

18702161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18702161 is an equidigital number, since it uses as much as digits as its factorization.

18702161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 18702161 is about 4324.5995190306. The cubic root of 18702161 is about 265.4385097638.

The spelling of 18702161 in words is "eighteen million, seven hundred two thousand, one hundred sixty-one".