18924161 has 2 divisors, whose sum is σ = 18924162. Its totient is φ = 18924160.

The previous prime is 18924151. The next prime is 18924173. The reversal of 18924161 is 16142981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18653761 + 270400 = 4319^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 18924161 - 2⁶ = 18924097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18924121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9462080 + 9462081.

It is an arithmetic number, because the mean of its divisors is an integer number (9462081).

Almost surely, 2^18924161 is an apocalyptic number.

It is an amenable number.

18924161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18924161 is an equidigital number, since it uses as much as digits as its factorization.

18924161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 32.

The square root of 18924161 is about 4350.1909153507. The cubic root of 18924161 is about 266.4846582671.

The spelling of 18924161 in words is "eighteen million, nine hundred twenty-four thousand, one hundred sixty-one".