12555522 has 48 divisors (see below), whose sum is σ = 31292352. Its totient is φ = 3564000.

The previous prime is 12555511. The next prime is 12555547. The reversal of 12555522 is 22555521.

12555522 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12555522² = 315282265384968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31428 + ... + 31824.

It is an arithmetic number, because the mean of its divisors is an integer number (651924).

Almost surely, 2^12555522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12555522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15646176).

12555522 is an abundant number, since it is smaller than the sum of its proper divisors (18736830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12555522 is a wasteful number, since it uses less digits than its factorization.

12555522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663 (or 660 counting only the distinct ones).

The product of its digits is 5000, while the sum is 27.

The square root of 12555522 is about 3543.3772026133. The cubic root of 12555522 is about 232.4225479094.

Subtracting 12555522 from its reverse (22555521), we obtain a palindrome (9999999).

The spelling of 12555522 in words is "twelve million, five hundred fifty-five thousand, five hundred twenty-two".