18934081 has 2 divisors, whose sum is σ = 18934082. Its totient is φ = 18934080.

The previous prime is 18934057. The next prime is 18934117. The reversal of 18934081 is 18043981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17472400 + 1461681 = 4180^2 + 1209^2 .

It is an emirp because it is prime and its reverse (18043981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18934081 - 2⁹ = 18933569 is a prime.

It is a super-2 number, since 2×18934081² = 716998846629122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18934001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9467040 + 9467041.

It is an arithmetic number, because the mean of its divisors is an integer number (9467041).

Almost surely, 2^18934081 is an apocalyptic number.

It is an amenable number.

18934081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18934081 is an equidigital number, since it uses as much as digits as its factorization.

18934081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18934081 is about 4351.3309458142. The cubic root of 18934081 is about 266.5312136738.

The spelling of 18934081 in words is "eighteen million, nine hundred thirty-four thousand, eighty-one".