13197591 has 18 divisors (see below), whose sum is σ = 20955480. Its totient is φ = 7997880.

The previous prime is 13197563. The next prime is 13197601. The reversal of 13197591 is 19579131.

13197591 = 764² + 765² + ... + 785².

13197591 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13197591 - 2⁷ = 13197463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13197391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4971 + ... + 7148.

Almost surely, 2^13197591 is an apocalyptic number.

13197591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13197591 is a deficient number, since it is larger than the sum of its proper divisors (7757889).

13197591 is a wasteful number, since it uses less digits than its factorization.

13197591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12147 (or 12133 counting only the distinct ones).

The product of its digits is 8505, while the sum is 36.

The square root of 13197591 is about 3632.8488820759. The cubic root of 13197591 is about 236.3187722855.

The spelling of 13197591 in words is "thirteen million, one hundred ninety-seven thousand, five hundred ninety-one".