18011101 has 2 divisors, whose sum is σ = 18011102. Its totient is φ = 18011100.

The previous prime is 18011039. The next prime is 18011113. The reversal of 18011101 is 10111081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9308601 + 8702500 = 3051^2 + 2950^2 .

It is an emirp because it is prime and its reverse (10111081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18011101 - 2⁹ = 18010589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18011401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9005550 + 9005551.

It is an arithmetic number, because the mean of its divisors is an integer number (9005551).

Almost surely, 2^18011101 is an apocalyptic number.

It is an amenable number.

18011101 is a deficient number, since it is larger than the sum of its proper divisors (1).

18011101 is an equidigital number, since it uses as much as digits as its factorization.

18011101 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 13.

The square root of 18011101 is about 4243.9487508687. The cubic root of 18011101 is about 262.1280039978.

Adding to 18011101 its reverse (10111081), we get a palindrome (28122182).

The spelling of 18011101 in words is "eighteen million, eleven thousand, one hundred one".