189812317 has 2 divisors, whose sum is σ = 189812318. Its totient is φ = 189812316.

The previous prime is 189812303. The next prime is 189812321. The reversal of 189812317 is 713218981.

189812317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164198596 + 25613721 = 12814^2 + 5061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189812317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189812317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189812377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94906158 + 94906159.

It is an arithmetic number, because the mean of its divisors is an integer number (94906159).

Almost surely, 2^189812317 is an apocalyptic number.

It is an amenable number.

189812317 is a deficient number, since it is larger than the sum of its proper divisors (1).

189812317 is an equidigital number, since it uses as much as digits as its factorization.

189812317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 40.

The square root of 189812317 is about 13777.2390920678. The cubic root of 189812317 is about 574.7003525056.

The spelling of 189812317 in words is "one hundred eighty-nine million, eight hundred twelve thousand, three hundred seventeen".