12097891 has 8 divisors (see below), whose sum is σ = 13250160. Its totient is φ = 10977312.

The previous prime is 12097879. The next prime is 12097909. The reversal of 12097891 is 19879021.

12097891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12097891 - 2¹¹ = 12095843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12097891.

It is not an unprimeable number, because it can be changed into a prime (12097871) 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, 7120 + ... + 8653.

It is an arithmetic number, because the mean of its divisors is an integer number (1656270).

Almost surely, 2^12097891 is an apocalyptic number.

12097891 is a deficient number, since it is larger than the sum of its proper divisors (1152269).

12097891 is a wasteful number, since it uses less digits than its factorization.

12097891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15845.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 12097891 is about 3478.2022655389. The cubic root of 12097891 is about 229.5637034551.

It can be divided in two parts, 1209789 and 1, that added together give a triangular number (1209790 = T₁₅₅₅).

The spelling of 12097891 in words is "twelve million, ninety-seven thousand, eight hundred ninety-one".