12091631591 has 4 divisors (see below), whose sum is σ = 13021757112. Its totient is φ = 11161506072.

The previous prime is 12091631567. The next prime is 12091631593. The reversal of 12091631591 is 19513619021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12091631591 - 2⁶ = 12091631527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12091631593) 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, 465062741 + ... + 465062766.

It is an arithmetic number, because the mean of its divisors is an integer number (3255439278).

Almost surely, 2^12091631591 is an apocalyptic number.

12091631591 is a deficient number, since it is larger than the sum of its proper divisors (930125521).

12091631591 is an equidigital number, since it uses as much as digits as its factorization.

12091631591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930125520.

The product of its (nonzero) digits is 14580, while the sum is 38.

The spelling of 12091631591 in words is "twelve billion, ninety-one million, six hundred thirty-one thousand, five hundred ninety-one".