18168901 has 2 divisors, whose sum is σ = 18168902. Its totient is φ = 18168900.

The previous prime is 18168889. The next prime is 18168923. The reversal of 18168901 is 10986181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16008001 + 2160900 = 4001^2 + 1470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18168901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18168701) 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, 9084450 + 9084451.

It is an arithmetic number, because the mean of its divisors is an integer number (9084451).

Almost surely, 2^18168901 is an apocalyptic number.

It is an amenable number.

18168901 is a deficient number, since it is larger than the sum of its proper divisors (1).

18168901 is an equidigital number, since it uses as much as digits as its factorization.

18168901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 18168901 is about 4262.4993841642. The cubic root of 18168901 is about 262.8913033260.

The spelling of 18168901 in words is "eighteen million, one hundred sixty-eight thousand, nine hundred one".