15221263 has 2 divisors, whose sum is σ = 15221264. Its totient is φ = 15221262.

The previous prime is 15221251. The next prime is 15221281. The reversal of 15221263 is 36212251.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15221263 - 2⁵ = 15221231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15221203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610631 + 7610632.

It is an arithmetic number, because the mean of its divisors is an integer number (7610632).

Almost surely, 2^15221263 is an apocalyptic number.

15221263 is a deficient number, since it is larger than the sum of its proper divisors (1).

15221263 is an equidigital number, since it uses as much as digits as its factorization.

15221263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 15221263 is about 3901.4437071423. The cubic root of 15221263 is about 247.8279189096.

The spelling of 15221263 in words is "fifteen million, two hundred twenty-one thousand, two hundred sixty-three".