23505115209 has 4 divisors (see below), whose sum is σ = 31340153616. Its totient is φ = 15670076804.

The previous prime is 23505115159. The next prime is 23505115219. The reversal of 23505115209 is 90251150532.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23505115209 - 2¹⁵ = 23505082441 is a prime.

It is a super-2 number, since 2×23505115209² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23505115209.

It is not an unprimeable number, because it can be changed into a prime (23505115219) 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, 3917519199 + ... + 3917519204.

It is an arithmetic number, because the mean of its divisors is an integer number (7835038404).

Almost surely, 2^23505115209 is an apocalyptic number.

It is an amenable number.

23505115209 is a deficient number, since it is larger than the sum of its proper divisors (7835038407).

23505115209 is an equidigital number, since it uses as much as digits as its factorization.

23505115209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7835038406.

The product of its (nonzero) digits is 13500, while the sum is 33.

The spelling of 23505115209 in words is "twenty-three billion, five hundred five million, one hundred fifteen thousand, two hundred nine".