68912189 has 2 divisors, whose sum is σ = 68912190. Its totient is φ = 68912188.

The previous prime is 68912171. The next prime is 68912191. The reversal of 68912189 is 98121986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61889689 + 7022500 = 7867^2 + 2650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68912189 is a prime.

Together with 68912191, 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 (68912989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34456094 + 34456095.

It is an arithmetic number, because the mean of its divisors is an integer number (34456095).

Almost surely, 2^68912189 is an apocalyptic number.

It is an amenable number.

68912189 is a deficient number, since it is larger than the sum of its proper divisors (1).

68912189 is an equidigital number, since it uses as much as digits as its factorization.

68912189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 44.

The square root of 68912189 is about 8301.3365791299. The cubic root of 68912189 is about 409.9825275124.

The spelling of 68912189 in words is "sixty-eight million, nine hundred twelve thousand, one hundred eighty-nine".