23971583509 has 2 divisors, whose sum is σ = 23971583510. Its totient is φ = 23971583508.

The previous prime is 23971583507. The next prime is 23971583513. The reversal of 23971583509 is 90538517932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21127494609 + 2844088900 = 145353^2 + 53330^2 .

It is a cyclic number.

It is not a de Polignac number, because 23971583509 - 2¹ = 23971583507 is a prime.

Together with 23971583507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23971583507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11985791754 + 11985791755.

It is an arithmetic number, because the mean of its divisors is an integer number (11985791755).

Almost surely, 2^23971583509 is an apocalyptic number.

It is an amenable number.

23971583509 is a deficient number, since it is larger than the sum of its proper divisors (1).

23971583509 is an equidigital number, since it uses as much as digits as its factorization.

23971583509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 52.

The spelling of 23971583509 in words is "twenty-three billion, nine hundred seventy-one million, five hundred eighty-three thousand, five hundred nine".