23987688181 has 2 divisors, whose sum is σ = 23987688182. Its totient is φ = 23987688180.

The previous prime is 23987688079. The next prime is 23987688203. The reversal of 23987688181 is 18188678932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15664775281 + 8322912900 = 125159^2 + 91230^2 .

It is a cyclic number.

It is not a de Polignac number, because 23987688181 - 2¹⁷ = 23987557109 is a prime.

It is a super-2 number, since 2×23987688181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23987688481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11993844090 + 11993844091.

It is an arithmetic number, because the mean of its divisors is an integer number (11993844091).

Almost surely, 2^23987688181 is an apocalyptic number.

It is an amenable number.

23987688181 is a deficient number, since it is larger than the sum of its proper divisors (1).

23987688181 is an equidigital number, since it uses as much as digits as its factorization.

23987688181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9289728, while the sum is 61.

The spelling of 23987688181 in words is "twenty-three billion, nine hundred eighty-seven million, six hundred eighty-eight thousand, one hundred eighty-one".