12554991 has 12 divisors (see below), whose sum is σ = 19089720. Its totient is φ = 7929360.

The previous prime is 12554981. The next prime is 12555041. The reversal of 12554991 is 19945521.

12554991 is a `hidden beast` number, since 1 + 25 + 549 + 91 = 666.

It is not a de Polignac number, because 12554991 - 2¹⁴ = 12538607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12554911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36540 + ... + 36881.

It is an arithmetic number, because the mean of its divisors is an integer number (1590810).

Almost surely, 2^12554991 is an apocalyptic number.

12554991 is a deficient number, since it is larger than the sum of its proper divisors (6534729).

12554991 is a wasteful number, since it uses less digits than its factorization.

12554991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73446 (or 73443 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 12554991 is about 3543.3022733038. The cubic root of 12554991 is about 232.4192713136.

The spelling of 12554991 in words is "twelve million, five hundred fifty-four thousand, nine hundred ninety-one".