18125249 has 4 divisors (see below), whose sum is σ = 18141636. Its totient is φ = 18108864.

The previous prime is 18125201. The next prime is 18125251. The reversal of 18125249 is 94252181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94252181 = 3659 ⋅25759.

It can be written as a sum of positive squares in 2 ways, for example, as 14684224 + 3441025 = 3832^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 18125249 - 2¹² = 18121153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18125279) 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, 6404 + ... + 8789.

It is an arithmetic number, because the mean of its divisors is an integer number (4535409).

Almost surely, 2^18125249 is an apocalyptic number.

It is an amenable number.

18125249 is a deficient number, since it is larger than the sum of its proper divisors (16387).

18125249 is a wasteful number, since it uses less digits than its factorization.

18125249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16386.

The product of its digits is 5760, while the sum is 32.

The square root of 18125249 is about 4257.3758349481. The cubic root of 18125249 is about 262.6805965096.

The spelling of 18125249 in words is "eighteen million, one hundred twenty-five thousand, two hundred forty-nine".