23728181 has 2 divisors, whose sum is σ = 23728182. Its totient is φ = 23728180.

The previous prime is 23728171. The next prime is 23728183. The reversal of 23728181 is 18182732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19945156 + 3783025 = 4466^2 + 1945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23728181 is a prime.

It is a super-2 number, since 2×23728181² = 1126053147137522, which contains 22 as substring.

Together with 23728183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23728183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11864090 + 11864091.

It is an arithmetic number, because the mean of its divisors is an integer number (11864091).

Almost surely, 2^23728181 is an apocalyptic number.

It is an amenable number.

23728181 is a deficient number, since it is larger than the sum of its proper divisors (1).

23728181 is an equidigital number, since it uses as much as digits as its factorization.

23728181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 32.

The square root of 23728181 is about 4871.1580758583. The cubic root of 23728181 is about 287.3568022861.

The spelling of 23728181 in words is "twenty-three million, seven hundred twenty-eight thousand, one hundred eighty-one".