12219091 has 4 divisors (see below), whose sum is σ = 12262552. Its totient is φ = 12175632.

The previous prime is 12219089. The next prime is 12219101. The reversal of 12219091 is 19091221.

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 12219091 - 2¹ = 12219089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12219061) 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, 21306 + ... + 21871.

It is an arithmetic number, because the mean of its divisors is an integer number (3065638).

Almost surely, 2^12219091 is an apocalyptic number.

12219091 is a deficient number, since it is larger than the sum of its proper divisors (43461).

12219091 is an equidigital number, since it uses as much as digits as its factorization.

12219091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43460.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 12219091 is about 3495.5816397275. The cubic root of 12219091 is about 230.3277683469.

It can be divided in two parts, 1221 and 9091, that multiplied together give a palindrome (11100111).

The spelling of 12219091 in words is "twelve million, two hundred nineteen thousand, ninety-one".