18231107 has 4 divisors (see below), whose sum is σ = 18259680. Its totient is φ = 18202536.

The previous prime is 18231091. The next prime is 18231113. The reversal of 18231107 is 70113281.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18231107 - 2⁴ = 18231091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18231137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13307 + ... + 14612.

It is an arithmetic number, because the mean of its divisors is an integer number (4564920).

Almost surely, 2^18231107 is an apocalyptic number.

18231107 is a deficient number, since it is larger than the sum of its proper divisors (28573).

18231107 is an equidigital number, since it uses as much as digits as its factorization.

18231107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28572.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 18231107 is about 4269.7900416765. The cubic root of 18231107 is about 263.1909873563.

Adding to 18231107 its reverse (70113281), we get a palindrome (88344388).

The spelling of 18231107 in words is "eighteen million, two hundred thirty-one thousand, one hundred seven".