23971 has 2 divisors, whose sum is σ = 23972.
Its totient is φ = 23970.
The previous prime is 23957. The next prime is 23977. The reversal of 23971 is 17932.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 23971 - 29 = 23459 is a prime.
23971 is a lucky number.
It is not a weakly prime, because it can be changed into another prime (23977) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11985 + 11986.
It is an arithmetic number, because the mean of its divisors is an integer number (11986).
223971 is an apocalyptic number.
23971 is a deficient number, since it is larger than the sum of its proper divisors (1).
23971 is an equidigital number, since it uses as much as digits as its factorization.
23971 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 378, while the sum is 22.
The square root of 23971 is about 154.8257084595.
The cubic root of 23971 is about 28.8333686019.
The spelling of 23971 in words is "twenty-three thousand, nine hundred seventy-one".