18451249 has 2 divisors, whose sum is σ = 18451250. Its totient is φ = 18451248.

The previous prime is 18451211. The next prime is 18451253. The reversal of 18451249 is 94215481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17514225 + 937024 = 4185^2 + 968^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18451249 is a prime.

It is not a weakly prime, because it can be changed into another prime (18451259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9225624 + 9225625.

It is an arithmetic number, because the mean of its divisors is an integer number (9225625).

Almost surely, 2^18451249 is an apocalyptic number.

It is an amenable number.

18451249 is a deficient number, since it is larger than the sum of its proper divisors (1).

18451249 is an equidigital number, since it uses as much as digits as its factorization.

18451249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 18451249 is about 4295.4917064290. The cubic root of 18451249 is about 264.2461021990.

The spelling of 18451249 in words is "eighteen million, four hundred fifty-one thousand, two hundred forty-nine".