15222913 has 2 divisors, whose sum is σ = 15222914. Its totient is φ = 15222912.

The previous prime is 15222901. The next prime is 15222917. The reversal of 15222913 is 31922251.

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., 15000129 + 222784 = 3873^2 + 472^2 .

It is an emirp because it is prime and its reverse (31922251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15222913 - 2¹³ = 15214721 is a prime.

It is not a weakly prime, because it can be changed into another prime (15222917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7611456 + 7611457.

It is an arithmetic number, because the mean of its divisors is an integer number (7611457).

Almost surely, 2^15222913 is an apocalyptic number.

It is an amenable number.

15222913 is a deficient number, since it is larger than the sum of its proper divisors (1).

15222913 is an equidigital number, since it uses as much as digits as its factorization.

15222913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

The square root of 15222913 is about 3901.6551615949. The cubic root of 15222913 is about 247.8368735167.

The spelling of 15222913 in words is "fifteen million, two hundred twenty-two thousand, nine hundred thirteen".