23409918009 has 9 divisors (see below), whose sum is σ = 33814989039. Its totient is φ = 15606306000.

The previous prime is 23409917981. The next prime is 23409918011. The reversal of 23409918009 is 90081990432.

The square root of 23409918009 is 153003.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 18877935609 + 4531982400 = 137397^2 + 67320^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 23409918009 - 2²¹ = 23407820857 is a prime.

It is a super-2 number, since 2×23409918009² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23409918079) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 433509 + ... + 484509.

Almost surely, 2^23409918009 is an apocalyptic number.

23409918009 is the 153003-rd square number.

23409918009 is the 76502-nd centered octagonal number.

It is an amenable number.

23409918009 is a deficient number, since it is larger than the sum of its proper divisors (10405071030).

23409918009 is an frugal number, since it uses more digits than its factorization.

23409918009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102008 (or 51004 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 23409918009 in words is "twenty-three billion, four hundred nine million, nine hundred eighteen thousand, nine".