12218691 has 8 divisors (see below), whose sum is σ = 17149120. Its totient is φ = 7717032.

The previous prime is 12218663. The next prime is 12218707. The reversal of 12218691 is 19681221.

It is a happy number.

12218691 is digitally balanced in base 2 and base 4, because in such bases 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 not a de Polignac number, because 12218691 - 2⁵ = 12218659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12218611) 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, 107125 + ... + 107238.

It is an arithmetic number, because the mean of its divisors is an integer number (2143640).

Almost surely, 2^12218691 is an apocalyptic number.

12218691 is a deficient number, since it is larger than the sum of its proper divisors (4930429).

12218691 is a wasteful number, since it uses less digits than its factorization.

12218691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214385.

The product of its digits is 1728, while the sum is 30.

The square root of 12218691 is about 3495.5244241744. The cubic root of 12218691 is about 230.3252550090.

The spelling of 12218691 in words is "twelve million, two hundred eighteen thousand, six hundred ninety-one".