18446081 has 2 divisors, whose sum is σ = 18446082. Its totient is φ = 18446080.

The previous prime is 18446063. The next prime is 18446089. The reversal of 18446081 is 18064481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18105025 + 341056 = 4255^2 + 584^2 .

It is an emirp because it is prime and its reverse (18064481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18446081 - 2²² = 14251777 is a prime.

It is a super-2 number, since 2×18446081² = 680515808517122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18446089) 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, 9223040 + 9223041.

It is an arithmetic number, because the mean of its divisors is an integer number (9223041).

Almost surely, 2^18446081 is an apocalyptic number.

It is an amenable number.

18446081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18446081 is an equidigital number, since it uses as much as digits as its factorization.

18446081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 18446081 is about 4294.8901033670. The cubic root of 18446081 is about 264.2214290477.

The spelling of 18446081 in words is "eighteen million, four hundred forty-six thousand, eighty-one".