12197591 has 4 divisors (see below), whose sum is σ = 13940112. Its totient is φ = 10455072.

The previous prime is 12197557. The next prime is 12197593. The reversal of 12197591 is 19579121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19579121 = 17 ⋅1151713.

It is a cyclic number.

It is not a de Polignac number, because 12197591 - 2⁶ = 12197527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12197593) 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, 871250 + ... + 871263.

It is an arithmetic number, because the mean of its divisors is an integer number (3485028).

Almost surely, 2^12197591 is an apocalyptic number.

12197591 is a deficient number, since it is larger than the sum of its proper divisors (1742521).

12197591 is an equidigital number, since it uses as much as digits as its factorization.

12197591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742520.

The product of its digits is 5670, while the sum is 35.

The square root of 12197591 is about 3492.5049749428. The cubic root of 12197591 is about 230.1925986001.

The spelling of 12197591 in words is "twelve million, one hundred ninety-seven thousand, five hundred ninety-one".