22001091 has 8 divisors (see below), whose sum is σ = 33525504. Its totient is φ = 12572040.

The previous prime is 22001071. The next prime is 22001101. The reversal of 22001091 is 19010022.

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 22001091 - 2⁷ = 22000963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22001091.

It is not an unprimeable number, because it can be changed into a prime (22001071) 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, 523815 + ... + 523856.

It is an arithmetic number, because the mean of its divisors is an integer number (4190688).

Almost surely, 2^22001091 is an apocalyptic number.

22001091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

22001091 is a deficient number, since it is larger than the sum of its proper divisors (11524413).

22001091 is a wasteful number, since it uses less digits than its factorization.

22001091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047681.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 22001091 is about 4690.5320593724. The cubic root of 22001091 is about 280.2085648449.

The spelling of 22001091 in words is "twenty-two million, one thousand, ninety-one".