18112489 has 4 divisors (see below), whose sum is σ = 18212740. Its totient is φ = 18012240.

The previous prime is 18112487. The next prime is 18112511. The reversal of 18112489 is 98421181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98421181 = 179 ⋅549839.

It can be written as a sum of positive squares in 2 ways, for example, as 6416089 + 11696400 = 2533^2 + 3420^2 .

It is a cyclic number.

It is not a de Polignac number, because 18112489 - 2¹ = 18112487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18112481) 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, 49854 + ... + 50215.

It is an arithmetic number, because the mean of its divisors is an integer number (4553185).

Almost surely, 2^18112489 is an apocalyptic number.

It is an amenable number.

18112489 is a deficient number, since it is larger than the sum of its proper divisors (100251).

18112489 is a wasteful number, since it uses less digits than its factorization.

18112489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100250.

The product of its digits is 4608, while the sum is 34.

The square root of 18112489 is about 4255.8769954029. The cubic root of 18112489 is about 262.6189405058.

The spelling of 18112489 in words is "eighteen million, one hundred twelve thousand, four hundred eighty-nine".