18100115 has 16 divisors (see below), whose sum is σ = 23832576. Its totient is φ = 13087200.

The previous prime is 18100111. The next prime is 18100151. The reversal of 18100115 is 51100181.

It is not a de Polignac number, because 18100115 - 2² = 18100111 is a prime.

It is a super-2 number, since 2×18100115² = 655228326026450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18100093 and 18100102.

It is not an unprimeable number, because it can be changed into a prime (18100111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9644 + ... + 11366.

It is an arithmetic number, because the mean of its divisors is an integer number (1489536).

Almost surely, 2^18100115 is an apocalyptic number.

18100115 is a deficient number, since it is larger than the sum of its proper divisors (5732461).

18100115 is a wasteful number, since it uses less digits than its factorization.

18100115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930.

The product of its (nonzero) digits is 40, while the sum is 17.

The square root of 18100115 is about 4254.4229926043. The cubic root of 18100115 is about 262.5591219817.

Adding to 18100115 its reverse (51100181), we get a palindrome (69200296).

The spelling of 18100115 in words is "eighteen million, one hundred thousand, one hundred fifteen".