12816091 has 4 divisors (see below), whose sum is σ = 12978400. Its totient is φ = 12653784.

The previous prime is 12816077. The next prime is 12816109. The reversal of 12816091 is 19061821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19061821 = 53 ⋅359657.

It is a cyclic number.

It is not a de Polignac number, because 12816091 - 2⁵ = 12816059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12816061) 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, 81036 + ... + 81193.

It is an arithmetic number, because the mean of its divisors is an integer number (3244600).

Almost surely, 2^12816091 is an apocalyptic number.

12816091 is a deficient number, since it is larger than the sum of its proper divisors (162309).

12816091 is an equidigital number, since it uses as much as digits as its factorization.

12816091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162308.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 12816091 is about 3579.9568433153. The cubic root of 12816091 is about 234.0193996140.

The spelling of 12816091 in words is "twelve million, eight hundred sixteen thousand, ninety-one".