23189009 has 4 divisors (see below), whose sum is σ = 23988660. Its totient is φ = 22389360.

The previous prime is 23188999. The next prime is 23189011. The reversal of 23189009 is 90098132.

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 5313025 + 17875984 = 2305^2 + 4228^2 .

It is a cyclic number.

It is not a de Polignac number, because 23189009 - 2⁴ = 23188993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23182009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399782 + ... + 399839.

It is an arithmetic number, because the mean of its divisors is an integer number (5997165).

Almost surely, 2^23189009 is an apocalyptic number.

23189009 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

23189009 is a deficient number, since it is larger than the sum of its proper divisors (799651).

23189009 is an equidigital number, since it uses as much as digits as its factorization.

23189009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799650.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 23189009 is about 4815.4967552683. The cubic root of 23189009 is about 285.1635831181.

The spelling of 23189009 in words is "twenty-three million, one hundred eighty-nine thousand, nine".