15222257 has 2 divisors, whose sum is σ = 15222258. Its totient is φ = 15222256.

The previous prime is 15222247. The next prime is 15222323. The reversal of 15222257 is 75222251.

15222257 is nontrivially palindromic in base 12.

15222257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7845601 + 7376656 = 2801^2 + 2716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15222257 is a prime.

It is not a weakly prime, because it can be changed into another prime (15222227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7611128 + 7611129.

It is an arithmetic number, because the mean of its divisors is an integer number (7611129).

Almost surely, 2^15222257 is an apocalyptic number.

It is an amenable number.

15222257 is a deficient number, since it is larger than the sum of its proper divisors (1).

15222257 is an equidigital number, since it uses as much as digits as its factorization.

15222257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2800, while the sum is 26.

The square root of 15222257 is about 3901.5710938031. The cubic root of 15222257 is about 247.8333134595.

The spelling of 15222257 in words is "fifteen million, two hundred twenty-two thousand, two hundred fifty-seven".