12551556 has 12 divisors (see below), whose sum is σ = 29286992. Its totient is φ = 4183848.

The previous prime is 12551549. The next prime is 12551557. The reversal of 12551556 is 65515521.

12551556 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 tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×12551556² = 315083116042272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12551557) 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, 522970 + ... + 522993.

Almost surely, 2^12551556 is an apocalyptic number.

It is an amenable number.

12551556 is an abundant number, since it is smaller than the sum of its proper divisors (16735436).

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

12551556 is a wasteful number, since it uses less digits than its factorization.

12551556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045970 (or 1045968 counting only the distinct ones).

The product of its digits is 7500, while the sum is 30.

The square root of 12551556 is about 3542.8175228199. The cubic root of 12551556 is about 232.3980730237.

It can be divided in two parts, 125 and 51556, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 12551556 in words is "twelve million, five hundred fifty-one thousand, five hundred fifty-six".