12319891 has 4 divisors (see below), whose sum is σ = 12382000. Its totient is φ = 12257784.

The previous prime is 12319877. The next prime is 12319907. The reversal of 12319891 is 19891321.

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 12319891 - 2⁵ = 12319859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12319831) 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, 30756 + ... + 31153.

It is an arithmetic number, because the mean of its divisors is an integer number (3095500).

Almost surely, 2^12319891 is an apocalyptic number.

12319891 is a deficient number, since it is larger than the sum of its proper divisors (62109).

12319891 is an equidigital number, since it uses as much as digits as its factorization.

12319891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62108.

The product of its digits is 3888, while the sum is 34.

The square root of 12319891 is about 3509.9702277940. The cubic root of 12319891 is about 230.9593889241.

The spelling of 12319891 in words is "twelve million, three hundred nineteen thousand, eight hundred ninety-one".