12031591 has 8 divisors (see below), whose sum is σ = 14135184. Its totient is φ = 10096320.

The previous prime is 12031571. The next prime is 12031603. The reversal of 12031591 is 19513021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12031591 - 2⁹ = 12031079 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 (12031561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41926 + ... + 42211.

It is an arithmetic number, because the mean of its divisors is an integer number (1766898).

Almost surely, 2^12031591 is an apocalyptic number.

12031591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12031591 is a deficient number, since it is larger than the sum of its proper divisors (2103593).

12031591 is a wasteful number, since it uses less digits than its factorization.

12031591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84161.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 12031591 is about 3468.6583861776. The cubic root of 12031591 is about 229.1435761786.

The spelling of 12031591 in words is "twelve million, thirty-one thousand, five hundred ninety-one".