23181989011 has 4 divisors (see below), whose sum is σ = 23182603792. Its totient is φ = 23181374232.

The previous prime is 23181989009. The next prime is 23181989081. The reversal of 23181989011 is 11098918132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23181989011 - 2¹ = 23181989009 is a prime.

It is a super-2 number, since 2×23181989011² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23181989081) 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, 246855 + ... + 327568.

It is an arithmetic number, because the mean of its divisors is an integer number (5795650948).

Almost surely, 2^23181989011 is an apocalyptic number.

23181989011 is a deficient number, since it is larger than the sum of its proper divisors (614781).

23181989011 is an equidigital number, since it uses as much as digits as its factorization.

23181989011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614780.

The product of its (nonzero) digits is 31104, while the sum is 43.

The spelling of 23181989011 in words is "twenty-three billion, one hundred eighty-one million, nine hundred eighty-nine thousand, eleven".