18010001 has 2 divisors, whose sum is σ = 18010002. Its totient is φ = 18010000.

The previous prime is 18009973. The next prime is 18010007. The reversal of 18010001 is 10001081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17808400 + 201601 = 4220^2 + 449^2 .

It is an emirp because it is prime and its reverse (10001081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18010001 is a prime.

It is not a weakly prime, because it can be changed into another prime (18010007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9005000 + 9005001.

It is an arithmetic number, because the mean of its divisors is an integer number (9005001).

Almost surely, 2^18010001 is an apocalyptic number.

It is an amenable number.

18010001 is a deficient number, since it is larger than the sum of its proper divisors (1).

18010001 is an equidigital number, since it uses as much as digits as its factorization.

18010001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 18010001 is about 4243.8191526030. The cubic root of 18010001 is about 262.1226675357.

Adding to 18010001 its reverse (10001081), we get a palindrome (28011082).

The spelling of 18010001 in words is "eighteen million, ten thousand, one".