22197691 has 4 divisors (see below), whose sum is σ = 23162832. Its totient is φ = 21232552.

The previous prime is 22197683. The next prime is 22197697. The reversal of 22197691 is 19679122.

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 22197691 - 2³ = 22197683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22197691.

It is not an unprimeable number, because it can be changed into a prime (22197697) 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, 482536 + ... + 482581.

It is an arithmetic number, because the mean of its divisors is an integer number (5790708).

Almost surely, 2^22197691 is an apocalyptic number.

22197691 is a deficient number, since it is larger than the sum of its proper divisors (965141).

22197691 is an equidigital number, since it uses as much as digits as its factorization.

22197691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965140.

The product of its digits is 13608, while the sum is 37.

The square root of 22197691 is about 4711.4425604055. The cubic root of 22197691 is about 281.0407315061.

Subtracting from 22197691 its reverse (19679122), we obtain a square (2518569 = 1587²).

The spelling of 22197691 in words is "twenty-two million, one hundred ninety-seven thousand, six hundred ninety-one".