18089081 has 2 divisors, whose sum is σ = 18089082. Its totient is φ = 18089080.

The previous prime is 18089039. The next prime is 18089117. The reversal of 18089081 is 18098081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16687225 + 1401856 = 4085^2 + 1184^2 .

It is a cyclic number.

It is not a de Polignac number, because 18089081 - 2¹⁴ = 18072697 is a prime.

It is a super-2 number, since 2×18089081² = 654429702849122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1156598 and since 18089081 and 1156598 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18089021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9044540 + 9044541.

It is an arithmetic number, because the mean of its divisors is an integer number (9044541).

Almost surely, 2^18089081 is an apocalyptic number.

It is an amenable number.

18089081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18089081 is an equidigital number, since it uses as much as digits as its factorization.

18089081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 18089081 is about 4253.1260268184. The cubic root of 18089081 is about 262.5057583015.

The spelling of 18089081 in words is "eighteen million, eighty-nine thousand, eighty-one".