23640181 has 2 divisors, whose sum is σ = 23640182. Its totient is φ = 23640180.

The previous prime is 23640137. The next prime is 23640193. The reversal of 23640181 is 18104632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19802500 + 3837681 = 4450^2 + 1959^2 .

It is a cyclic number.

It is not a de Polignac number, because 23640181 - 2¹⁹ = 23115893 is a prime.

It is a super-2 number, since 2×23640181² = 1117716315425522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23640121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11820090 + 11820091.

It is an arithmetic number, because the mean of its divisors is an integer number (11820091).

Almost surely, 2^23640181 is an apocalyptic number.

It is an amenable number.

23640181 is a deficient number, since it is larger than the sum of its proper divisors (1).

23640181 is an equidigital number, since it uses as much as digits as its factorization.

23640181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 23640181 is about 4862.1169257845. The cubic root of 23640181 is about 287.0011250143.

The spelling of 23640181 in words is "twenty-three million, six hundred forty thousand, one hundred eighty-one".