23171381 has 2 divisors, whose sum is σ = 23171382. Its totient is φ = 23171380.

The previous prime is 23171363. The next prime is 23171383. The reversal of 23171381 is 18317132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21022225 + 2149156 = 4585^2 + 1466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23171381 is a prime.

It is a super-2 number, since 2×23171381² = 1073825794894322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 23171383, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 23171381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23171383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11585690 + 11585691.

It is an arithmetic number, because the mean of its divisors is an integer number (11585691).

Almost surely, 2^23171381 is an apocalyptic number.

It is an amenable number.

23171381 is a deficient number, since it is larger than the sum of its proper divisors (1).

23171381 is an equidigital number, since it uses as much as digits as its factorization.

23171381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 23171381 is about 4813.6660665235. Note that the first 3 decimals coincide. The cubic root of 23171381 is about 285.0913055150.

The spelling of 23171381 in words is "twenty-three million, one hundred seventy-one thousand, three hundred eighty-one".