18903601 has 2 divisors, whose sum is σ = 18903602. Its totient is φ = 18903600.

The previous prime is 18903589. The next prime is 18903611. The reversal of 18903601 is 10630981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14899600 + 4004001 = 3860^2 + 2001^2 .

It is a cyclic number.

It is not a de Polignac number, because 18903601 - 2⁹ = 18903089 is a prime.

It is a super-2 number, since 2×18903601² = 714692261534402, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18903601.

It is not a weakly prime, because it can be changed into another prime (18903611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9451800 + 9451801.

It is an arithmetic number, because the mean of its divisors is an integer number (9451801).

Almost surely, 2^18903601 is an apocalyptic number.

It is an amenable number.

18903601 is a deficient number, since it is larger than the sum of its proper divisors (1).

18903601 is an equidigital number, since it uses as much as digits as its factorization.

18903601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 18903601 is about 4347.8271584781. The cubic root of 18903601 is about 266.3881166036.

The spelling of 18903601 in words is "eighteen million, nine hundred three thousand, six hundred one".