18926081 has 2 divisors, whose sum is σ = 18926082. Its totient is φ = 18926080.

The previous prime is 18926077. The next prime is 18926107. The reversal of 18926081 is 18062981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15335056 + 3591025 = 3916^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 18926081 - 2² = 18926077 is a prime.

It is a super-2 number, since 2×18926081² = 716393084037122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18926021) 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, 9463040 + 9463041.

It is an arithmetic number, because the mean of its divisors is an integer number (9463041).

Almost surely, 2^18926081 is an apocalyptic number.

It is an amenable number.

18926081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18926081 is an equidigital number, since it uses as much as digits as its factorization.

18926081 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 35.

The square root of 18926081 is about 4350.4115897234. The cubic root of 18926081 is about 266.4936702605.

The spelling of 18926081 in words is "eighteen million, nine hundred twenty-six thousand, eighty-one".