23181449 has 2 divisors, whose sum is σ = 23181450. Its totient is φ = 23181448.

The previous prime is 23181439. The next prime is 23181451. The reversal of 23181449 is 94418132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14684224 + 8497225 = 3832^2 + 2915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23181449 is a prime.

Together with 23181451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23181439) 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, 11590724 + 11590725.

It is an arithmetic number, because the mean of its divisors is an integer number (11590725).

Almost surely, 2^23181449 is an apocalyptic number.

It is an amenable number.

23181449 is a deficient number, since it is larger than the sum of its proper divisors (1).

23181449 is an equidigital number, since it uses as much as digits as its factorization.

23181449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 23181449 is about 4814.7117255346. The cubic root of 23181449 is about 285.1325904036.

The spelling of 23181449 in words is "twenty-three million, one hundred eighty-one thousand, four hundred forty-nine".