71668189 has 2 divisors, whose sum is σ = 71668190. Its totient is φ = 71668188.

The previous prime is 71668183. The next prime is 71668231. The reversal of 71668189 is 98186617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66145689 + 5522500 = 8133^2 + 2350^2 .

It is an emirp because it is prime and its reverse (98186617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71668189 - 2⁷ = 71668061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71668183) 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, 35834094 + 35834095.

It is an arithmetic number, because the mean of its divisors is an integer number (35834095).

Almost surely, 2^71668189 is an apocalyptic number.

It is an amenable number.

71668189 is a deficient number, since it is larger than the sum of its proper divisors (1).

71668189 is an equidigital number, since it uses as much as digits as its factorization.

71668189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 46.

The square root of 71668189 is about 8465.7066450474. The cubic root of 71668189 is about 415.3767112148.

The spelling of 71668189 in words is "seventy-one million, six hundred sixty-eight thousand, one hundred eighty-nine".