22029509 has 4 divisors (see below), whose sum is σ = 22046316. Its totient is φ = 22012704.

The previous prime is 22029487. The next prime is 22029529. The reversal of 22029509 is 90592022.

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 7756225 + 14273284 = 2785^2 + 3778^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22029509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22029529) 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, 6254 + ... + 9119.

It is an arithmetic number, because the mean of its divisors is an integer number (5511579).

Almost surely, 2^22029509 is an apocalyptic number.

It is an amenable number.

22029509 is a deficient number, since it is larger than the sum of its proper divisors (16807).

22029509 is a wasteful number, since it uses less digits than its factorization.

22029509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16806.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 22029509 is about 4693.5603756637. The cubic root of 22029509 is about 280.3291579701.

It can be divided in two parts, 2202 and 9509, that added together give a palindrome (11711).

The spelling of 22029509 in words is "twenty-two million, twenty-nine thousand, five hundred nine".