22505257 has 4 divisors (see below), whose sum is σ = 22520916. Its totient is φ = 22489600.

The previous prime is 22505251. The next prime is 22505317. The reversal of 22505257 is 75250522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75250522 = 2 ⋅37625261.

It can be written as a sum of positive squares in 2 ways, for example, as 12702096 + 9803161 = 3564^2 + 3131^2 .

It is a cyclic number.

It is not a de Polignac number, because 22505257 - 2⁷ = 22505129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22505251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5428 + ... + 8629.

It is an arithmetic number, because the mean of its divisors is an integer number (5630229).

Almost surely, 2^22505257 is an apocalyptic number.

It is an amenable number.

22505257 is a deficient number, since it is larger than the sum of its proper divisors (15659).

22505257 is a wasteful number, since it uses less digits than its factorization.

22505257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15658.

The product of its (nonzero) digits is 7000, while the sum is 28.

The square root of 22505257 is about 4743.9705943439. The cubic root of 22505257 is about 282.3327937362.

Adding to 22505257 its reverse (75250522), we get a palindrome (97755779).

The spelling of 22505257 in words is "twenty-two million, five hundred five thousand, two hundred fifty-seven".