23106509 has 4 divisors (see below), whose sum is σ = 23190204. Its totient is φ = 23022816.

The previous prime is 23106497. The next prime is 23106511. The reversal of 23106509 is 90560132.

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 2630884 + 20475625 = 1622^2 + 4525^2 .

It is a cyclic number.

It is not a de Polignac number, because 23106509 - 2¹² = 23102413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23106529) 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, 41432 + ... + 41985.

It is an arithmetic number, because the mean of its divisors is an integer number (5797551).

Almost surely, 2^23106509 is an apocalyptic number.

It is an amenable number.

23106509 is a deficient number, since it is larger than the sum of its proper divisors (83695).

23106509 is an equidigital number, since it uses as much as digits as its factorization.

23106509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83694.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 23106509 is about 4806.9230282999. The cubic root of 23106509 is about 284.8250038869.

The spelling of 23106509 in words is "twenty-three million, one hundred six thousand, five hundred nine".