18443081 has 2 divisors, whose sum is σ = 18443082. Its totient is φ = 18443080.

The previous prime is 18443063. The next prime is 18443093. The reversal of 18443081 is 18034481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14100025 + 4343056 = 3755^2 + 2084^2 .

It is an emirp because it is prime and its reverse (18034481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18443081 - 2¹⁸ = 18180937 is a prime.

It is a super-2 number, since 2×18443081² = 680294473545122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18445081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9221540 + 9221541.

It is an arithmetic number, because the mean of its divisors is an integer number (9221541).

Almost surely, 2^18443081 is an apocalyptic number.

It is an amenable number.

18443081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18443081 is an equidigital number, since it uses as much as digits as its factorization.

18443081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 18443081 is about 4294.5408369231. The cubic root of 18443081 is about 264.2071042839.

The spelling of 18443081 in words is "eighteen million, four hundred forty-three thousand, eighty-one".