22681891 has 4 divisors (see below), whose sum is σ = 22698000. Its totient is φ = 22665784.

The previous prime is 22681849. The next prime is 22681931. The reversal of 22681891 is 19818622.

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 22681891 - 2¹⁷ = 22550819 is a prime.

It is a super-3 number, since 3×22681891³ (a number of 23 digits) contains 333 as substring.

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 22681891.

It is not an unprimeable number, because it can be changed into a prime (22681091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5716 + ... + 8833.

It is an arithmetic number, because the mean of its divisors is an integer number (5674500).

Almost surely, 2^22681891 is an apocalyptic number.

22681891 is a deficient number, since it is larger than the sum of its proper divisors (16109).

22681891 is a wasteful number, since it uses less digits than its factorization.

22681891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16108.

The product of its digits is 13824, while the sum is 37.

The square root of 22681891 is about 4762.5508921165. The cubic root of 22681891 is about 283.0695055839.

The spelling of 22681891 in words is "twenty-two million, six hundred eighty-one thousand, eight hundred ninety-one".