15421249 has 2 divisors, whose sum is σ = 15421250. Its totient is φ = 15421248.

The previous prime is 15421213. The next prime is 15421253. The reversal of 15421249 is 94212451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8661249 + 6760000 = 2943^2 + 2600^2 .

It is an emirp because it is prime and its reverse (94212451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15421249 - 2⁷ = 15421121 is a prime.

It is not a weakly prime, because it can be changed into another prime (15428249) 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, 7710624 + 7710625.

It is an arithmetic number, because the mean of its divisors is an integer number (7710625).

Almost surely, 2^15421249 is an apocalyptic number.

It is an amenable number.

15421249 is a deficient number, since it is larger than the sum of its proper divisors (1).

15421249 is an equidigital number, since it uses as much as digits as its factorization.

15421249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

The square root of 15421249 is about 3926.9898140943. The cubic root of 15421249 is about 248.9085700568.

The spelling of 15421249 in words is "fifteen million, four hundred twenty-one thousand, two hundred forty-nine".