22515257 has 2 divisors, whose sum is σ = 22515258. Its totient is φ = 22515256.

The previous prime is 22515239. The next prime is 22515289. The reversal of 22515257 is 75251522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21307456 + 1207801 = 4616^2 + 1099^2 .

It is a cyclic number.

It is not a de Polignac number, because 22515257 - 2⁶ = 22515193 is a prime.

It is not a weakly prime, because it can be changed into another prime (22515217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11257628 + 11257629.

It is an arithmetic number, because the mean of its divisors is an integer number (11257629).

Almost surely, 2^22515257 is an apocalyptic number.

It is an amenable number.

22515257 is a deficient number, since it is larger than the sum of its proper divisors (1).

22515257 is an equidigital number, since it uses as much as digits as its factorization.

22515257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7000, while the sum is 29.

The square root of 22515257 is about 4745.0244467231. The cubic root of 22515257 is about 282.3746048542.

Adding to 22515257 its reverse (75251522), we get a palindrome (97766779).

The spelling of 22515257 in words is "twenty-two million, five hundred fifteen thousand, two hundred fifty-seven".