18090001 has 2 divisors, whose sum is σ = 18090002. Its totient is φ = 18090000.

The previous prime is 18089969. The next prime is 18090031. The reversal of 18090001 is 10009081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16613776 + 1476225 = 4076^2 + 1215^2 .

It is a cyclic number.

It is not a de Polignac number, because 18090001 - 2⁵ = 18089969 is a prime.

It is not a weakly prime, because it can be changed into another prime (18090031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9045000 + 9045001.

It is an arithmetic number, because the mean of its divisors is an integer number (9045001).

Almost surely, 2^18090001 is an apocalyptic number.

It is an amenable number.

18090001 is a deficient number, since it is larger than the sum of its proper divisors (1).

18090001 is an equidigital number, since it uses as much as digits as its factorization.

18090001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 18090001 is about 4253.2341811849. The cubic root of 18090001 is about 262.5102085221.

Adding to 18090001 its reverse (10009081), we get a palindrome (28099082).

The spelling of 18090001 in words is "eighteen million, ninety thousand, one".