18151249 has 2 divisors, whose sum is σ = 18151250. Its totient is φ = 18151248.

The previous prime is 18151219. The next prime is 18151253. The reversal of 18151249 is 94215181.

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., 11102224 + 7049025 = 3332^2 + 2655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18151249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18151249.

It is not a weakly prime, because it can be changed into another prime (18151219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9075624 + 9075625.

It is an arithmetic number, because the mean of its divisors is an integer number (9075625).

Almost surely, 2^18151249 is an apocalyptic number.

It is an amenable number.

18151249 is a deficient number, since it is larger than the sum of its proper divisors (1).

18151249 is an equidigital number, since it uses as much as digits as its factorization.

18151249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 31.

The square root of 18151249 is about 4260.4282648579. The cubic root of 18151249 is about 262.8061383704.

The spelling of 18151249 in words is "eighteen million, one hundred fifty-one thousand, two hundred forty-nine".