18645161 has 2 divisors, whose sum is σ = 18645162. Its totient is φ = 18645160.

The previous prime is 18645139. The next prime is 18645181. The reversal of 18645161 is 16154681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10118761 + 8526400 = 3181^2 + 2920^2 .

It is a cyclic number.

It is not a de Polignac number, because 18645161 - 2¹⁴ = 18628777 is a prime.

It is not a weakly prime, because it can be changed into another prime (18645131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9322580 + 9322581.

It is an arithmetic number, because the mean of its divisors is an integer number (9322581).

Almost surely, 2^18645161 is an apocalyptic number.

It is an amenable number.

18645161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18645161 is an equidigital number, since it uses as much as digits as its factorization.

18645161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 32.

The square root of 18645161 is about 4318.0042843888. The cubic root of 18645161 is about 265.1685696201.

The spelling of 18645161 in words is "eighteen million, six hundred forty-five thousand, one hundred sixty-one".