12135591 has 12 divisors (see below), whose sum is σ = 18877768. Its totient is φ = 7467984.

The previous prime is 12135587. The next prime is 12135611. The reversal of 12135591 is 19553121.

It is not a de Polignac number, because 12135591 - 2² = 12135587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12135521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51745 + ... + 51978.

Almost surely, 2^12135591 is an apocalyptic number.

12135591 is a deficient number, since it is larger than the sum of its proper divisors (6742177).

12135591 is a wasteful number, since it uses less digits than its factorization.

12135591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103742 (or 103739 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 12135591 is about 3483.6175163183. The cubic root of 12135591 is about 229.8019151470.

The spelling of 12135591 in words is "twelve million, one hundred thirty-five thousand, five hundred ninety-one".