18793121 has 2 divisors, whose sum is σ = 18793122. Its totient is φ = 18793120.

The previous prime is 18793097. The next prime is 18793133. The reversal of 18793121 is 12139781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18318400 + 474721 = 4280^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 18793121 - 2²² = 14598817 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18793321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9396560 + 9396561.

It is an arithmetic number, because the mean of its divisors is an integer number (9396561).

Almost surely, 2^18793121 is an apocalyptic number.

It is an amenable number.

18793121 is a deficient number, since it is larger than the sum of its proper divisors (1).

18793121 is an equidigital number, since it uses as much as digits as its factorization.

18793121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 32.

The square root of 18793121 is about 4335.1033436355. The cubic root of 18793121 is about 265.8681437061.

The spelling of 18793121 in words is "eighteen million, seven hundred ninety-three thousand, one hundred twenty-one".