12565522 has 4 divisors (see below), whose sum is σ = 18848286. Its totient is φ = 6282760.

The previous prime is 12565519. The next prime is 12565537. The reversal of 12565522 is 22556521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22556521 = 13 ⋅1735117.

It can be written as a sum of positive squares in only one way, i.e., 7187761 + 5377761 = 2681^2 + 2319^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3141379 + ... + 3141382.

Almost surely, 2^12565522 is an apocalyptic number.

12565522 is a deficient number, since it is larger than the sum of its proper divisors (6282764).

12565522 is an equidigital number, since it uses as much as digits as its factorization.

12565522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6282763.

The product of its digits is 6000, while the sum is 28.

The square root of 12565522 is about 3544.7880049447. The cubic root of 12565522 is about 232.4842368008.

Subtracting 12565522 from its reverse (22556521), we obtain a palindrome (9990999).

The spelling of 12565522 in words is "twelve million, five hundred sixty-five thousand, five hundred twenty-two".