22289991 has 8 divisors (see below), whose sum is σ = 29898624. Its totient is φ = 14770680.

The previous prime is 22289989. The next prime is 22289999. The reversal of 22289991 is 19998222.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22289991 - 2¹ = 22289989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22289999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21745 + ... + 22746.

It is an arithmetic number, because the mean of its divisors is an integer number (3737328).

Almost surely, 2^22289991 is an apocalyptic number.

22289991 is a deficient number, since it is larger than the sum of its proper divisors (7608633).

22289991 is a wasteful number, since it uses less digits than its factorization.

22289991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44661.

The product of its digits is 46656, while the sum is 42.

The square root of 22289991 is about 4721.2277005033. The cubic root of 22289991 is about 281.4297237462.

The spelling of 22289991 in words is "twenty-two million, two hundred eighty-nine thousand, nine hundred ninety-one".