80640181 has 2 divisors, whose sum is σ = 80640182. Its totient is φ = 80640180.

The previous prime is 80640151. The next prime is 80640187. The reversal of 80640181 is 18104608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73702225 + 6937956 = 8585^2 + 2634^2 .

It is a cyclic number.

It is not a de Polignac number, because 80640181 - 2⁵ = 80640149 is a prime.

It is a super-2 number, since 2×80640181² = 13005677583425522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80640187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40320090 + 40320091.

It is an arithmetic number, because the mean of its divisors is an integer number (40320091).

Almost surely, 2^80640181 is an apocalyptic number.

It is an amenable number.

80640181 is a deficient number, since it is larger than the sum of its proper divisors (1).

80640181 is an equidigital number, since it uses as much as digits as its factorization.

80640181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 80640181 is about 8979.9878062278. The cubic root of 80640181 is about 432.0332425408.

Adding to 80640181 its reverse (18104608), we get a palindrome (98744789).

The spelling of 80640181 in words is "eighty million, six hundred forty thousand, one hundred eighty-one".