12812091 has 4 divisors (see below), whose sum is σ = 17082792. Its totient is φ = 8541392.

The previous prime is 12812087. The next prime is 12812117. The reversal of 12812091 is 19021821.

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 12812091 - 2² = 12812087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12812071) 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, 2135346 + ... + 2135351.

It is an arithmetic number, because the mean of its divisors is an integer number (4270698).

Almost surely, 2^12812091 is an apocalyptic number.

12812091 is a deficient number, since it is larger than the sum of its proper divisors (4270701).

12812091 is an equidigital number, since it uses as much as digits as its factorization.

12812091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4270700.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 12812091 is about 3579.3981337649. The cubic root of 12812091 is about 233.9950506660.

The spelling of 12812091 in words is "twelve million, eight hundred twelve thousand, ninety-one".