18490001 has 2 divisors, whose sum is σ = 18490002. Its totient is φ = 18490000.

The previous prime is 18489971. The next prime is 18490009. The reversal of 18490001 is 10009481.

18490001 is nontrivially palindromic in base 4.

It is a Cunningham number, because it is equal to 4300²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 1 = 4300^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 18490001 - 2⁶ = 18489937 is a prime.

It is not a weakly prime, because it can be changed into another prime (18490009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9245000 + 9245001.

It is an arithmetic number, because the mean of its divisors is an integer number (9245001).

Almost surely, 2^18490001 is an apocalyptic number.

It is an amenable number.

18490001 is a deficient number, since it is larger than the sum of its proper divisors (1).

18490001 is an equidigital number, since it uses as much as digits as its factorization.

18490001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 18490001 is about 4300.0001162791. Note that the first 3 decimals coincide. The cubic root of 18490001 is about 264.4309660069.

Adding to 18490001 its reverse (10009481), we get a palindrome (28499482).

The spelling of 18490001 in words is "eighteen million, four hundred ninety thousand, one".