15221149 has 2 divisors, whose sum is σ = 15221150. Its totient is φ = 15221148.

The previous prime is 15221099. The next prime is 15221153. The reversal of 15221149 is 94112251.

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., 10936249 + 4284900 = 3307^2 + 2070^2 .

It is a cyclic number.

It is not a de Polignac number, because 15221149 - 2⁹ = 15220637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15221159) 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, 7610574 + 7610575.

It is an arithmetic number, because the mean of its divisors is an integer number (7610575).

Almost surely, 2^15221149 is an apocalyptic number.

It is an amenable number.

15221149 is a deficient number, since it is larger than the sum of its proper divisors (1).

15221149 is an equidigital number, since it uses as much as digits as its factorization.

15221149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 25.

The square root of 15221149 is about 3901.4290971386. The cubic root of 15221149 is about 247.8273002037.

The spelling of 15221149 in words is "fifteen million, two hundred twenty-one thousand, one hundred forty-nine".