22691 has 2 divisors, whose sum is σ = 22692. Its totient is φ = 22690.

The previous prime is 22679. The next prime is 22697. The reversal of 22691 is 19622.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22691 is a prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (22697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11345 + 11346.

It is an arithmetic number, because the mean of its divisors is an integer number (11346).

2²²⁶⁹¹ is an apocalyptic number.

22691 is a deficient number, since it is larger than the sum of its proper divisors (1).

22691 is an equidigital number, since it uses as much as digits as its factorization.

22691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 20.

The square root of 22691 is about 150.6353212231. The cubic root of 22691 is about 28.3107393886.

The spelling of 22691 in words is "twenty-two thousand, six hundred ninety-one".