12641556 has 24 divisors (see below), whose sum is σ = 29903104. Its totient is φ = 4155840.

The previous prime is 12641549. The next prime is 12641561. The reversal of 12641556 is 65514621.

12641556 = T₃₄₁ + T₃₄₂ + ... + T₄₈₆.

It is a super-2 number, since 2×12641556² = 319617876202272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6340 + ... + 8091.

Almost surely, 2^12641556 is an apocalyptic number.

It is an amenable number.

12641556 is an abundant number, since it is smaller than the sum of its proper divisors (17261548).

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

12641556 is a wasteful number, since it uses less digits than its factorization.

12641556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14511 (or 14509 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 12641556 is about 3555.4965897888. The cubic root of 12641556 is about 232.9522150221.

The spelling of 12641556 in words is "twelve million, six hundred forty-one thousand, five hundred fifty-six".