13055991 has 16 divisors (see below), whose sum is σ = 19353600. Its totient is φ = 7774560.

The previous prime is 13055969. The next prime is 13055993. The reversal of 13055991 is 19955031.

It is not a de Polignac number, because 13055991 - 2⁷ = 13055863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13055993) 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 15 ways as a sum of consecutive naturals, for example, 4191 + ... + 6608.

It is an arithmetic number, because the mean of its divisors is an integer number (1209600).

Almost surely, 2^13055991 is an apocalyptic number.

13055991 is a deficient number, since it is larger than the sum of its proper divisors (6297609).

13055991 is a wasteful number, since it uses less digits than its factorization.

13055991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10846.

The product of its (nonzero) digits is 6075, while the sum is 33.

The square root of 13055991 is about 3613.3074876074. The cubic root of 13055991 is about 235.4705585690.

The spelling of 13055991 in words is "thirteen million, fifty-five thousand, nine hundred ninety-one".