22001009 has 4 divisors (see below), whose sum is σ = 23295204. Its totient is φ = 20706816.

The previous prime is 22000963. The next prime is 22001033. The reversal of 22001009 is 90010022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10758400 + 11242609 = 3280^2 + 3353^2 .

It is not a de Polignac number, because 22001009 - 2⁸ = 22000753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22000984 and 22001002.

It is not an unprimeable number, because it can be changed into a prime (22001209) 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, 647072 + ... + 647105.

It is an arithmetic number, because the mean of its divisors is an integer number (5823801).

Almost surely, 2^22001009 is an apocalyptic number.

It is an amenable number.

22001009 is a deficient number, since it is larger than the sum of its proper divisors (1294195).

22001009 is a wasteful number, since it uses less digits than its factorization.

22001009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294194.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 22001009 is about 4690.5233183516. The cubic root of 22001009 is about 280.2082167238.

The spelling of 22001009 in words is "twenty-two million, one thousand, nine".