23181317 has 2 divisors, whose sum is σ = 23181318. Its totient is φ = 23181316.

The previous prime is 23181289. The next prime is 23181329. The reversal of 23181317 is 71318132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21104836 + 2076481 = 4594^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 23181317 - 2⁶ = 23181253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23181377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11590658 + 11590659.

It is an arithmetic number, because the mean of its divisors is an integer number (11590659).

Almost surely, 2^23181317 is an apocalyptic number.

It is an amenable number.

23181317 is a deficient number, since it is larger than the sum of its proper divisors (1).

23181317 is an equidigital number, since it uses as much as digits as its factorization.

23181317 is an evil number, because the sum of its binary digits is even.

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

The square root of 23181317 is about 4814.6980175292. The cubic root of 23181317 is about 285.1320492011.

Adding to 23181317 its reverse (71318132), we get a palindrome (94499449).

The spelling of 23181317 in words is "twenty-three million, one hundred eighty-one thousand, three hundred seventeen".