71818193 has 2 divisors, whose sum is σ = 71818194. Its totient is φ = 71818192.

The previous prime is 71818177. The next prime is 71818207. The reversal of 71818193 is 39181817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66210769 + 5607424 = 8137^2 + 2368^2 .

It is an emirp because it is prime and its reverse (39181817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71818193 - 2⁴ = 71818177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71818093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35909096 + 35909097.

It is an arithmetic number, because the mean of its divisors is an integer number (35909097).

Almost surely, 2^71818193 is an apocalyptic number.

It is an amenable number.

71818193 is a deficient number, since it is larger than the sum of its proper divisors (1).

71818193 is an equidigital number, since it uses as much as digits as its factorization.

71818193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 38.

The square root of 71818193 is about 8474.5615225804. The cubic root of 71818193 is about 415.6663085405. Note that the first 3 decimals are identical.

The spelling of 71818193 in words is "seventy-one million, eight hundred eighteen thousand, one hundred ninety-three".