12243691 has 4 divisors (see below), whose sum is σ = 12528472. Its totient is φ = 11958912.

The previous prime is 12243661. The next prime is 12243701. The reversal of 12243691 is 19634221.

12243691 = 334² + 335² + ... + 419².

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 12243691 - 2⁷ = 12243563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12243601) 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, 142326 + ... + 142411.

It is an arithmetic number, because the mean of its divisors is an integer number (3132118).

Almost surely, 2^12243691 is an apocalyptic number.

12243691 is a deficient number, since it is larger than the sum of its proper divisors (284781).

12243691 is an equidigital number, since it uses as much as digits as its factorization.

12243691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284780.

The product of its digits is 2592, while the sum is 28.

The square root of 12243691 is about 3499.0985982107. The cubic root of 12243691 is about 230.4822333274.

It can be divided in two parts, 12 and 243691, that multiplied together give a palindrome (2924292).

The spelling of 12243691 in words is "twelve million, two hundred forty-three thousand, six hundred ninety-one".