22288891 has 4 divisors (see below), whose sum is σ = 22505392. Its totient is φ = 22072392.

The previous prime is 22288879. The next prime is 22288897. The reversal of 22288891 is 19888222.

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 22288891 - 2⁵ = 22288859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22288897) 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, 108096 + ... + 108301.

It is an arithmetic number, because the mean of its divisors is an integer number (5626348).

Almost surely, 2^22288891 is an apocalyptic number.

22288891 is a deficient number, since it is larger than the sum of its proper divisors (216501).

22288891 is a wasteful number, since it uses less digits than its factorization.

22288891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216500.

The product of its digits is 36864, while the sum is 40.

The square root of 22288891 is about 4721.1112039434. Note that the first 3 decimals coincide. The cubic root of 22288891 is about 281.4250941976.

The spelling of 22288891 in words is "twenty-two million, two hundred eighty-eight thousand, eight hundred ninety-one".