18403601 has 2 divisors, whose sum is σ = 18403602. Its totient is φ = 18403600.

The previous prime is 18403597. The next prime is 18403607. The reversal of 18403601 is 10630481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15840400 + 2563201 = 3980^2 + 1601^2 .

It is a cyclic number.

It is not a de Polignac number, because 18403601 - 2² = 18403597 is a prime.

It is not a weakly prime, because it can be changed into another prime (18403607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9201800 + 9201801.

It is an arithmetic number, because the mean of its divisors is an integer number (9201801).

Almost surely, 2^18403601 is an apocalyptic number.

It is an amenable number.

18403601 is a deficient number, since it is larger than the sum of its proper divisors (1).

18403601 is an equidigital number, since it uses as much as digits as its factorization.

18403601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 18403601 is about 4289.9418410976. The cubic root of 18403601 is about 264.0184454896.

The spelling of 18403601 in words is "eighteen million, four hundred three thousand, six hundred one".