492189689 has 2 divisors, whose sum is σ = 492189690. Its totient is φ = 492189688.

The previous prime is 492189647. The next prime is 492189743. The reversal of 492189689 is 986981294.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 475240000 + 16949689 = 21800^2 + 4117^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-492189689 is a prime.

It is not a weakly prime, because it can be changed into another prime (492189289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246094844 + 246094845.

It is an arithmetic number, because the mean of its divisors is an integer number (246094845).

Almost surely, 2^492189689 is an apocalyptic number.

It is an amenable number.

492189689 is a deficient number, since it is larger than the sum of its proper divisors (1).

492189689 is an equidigital number, since it uses as much as digits as its factorization.

492189689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 56.

The square root of 492189689 is about 22185.3485210397. The cubic root of 492189689 is about 789.5461202036.

The spelling of 492189689 in words is "four hundred ninety-two million, one hundred eighty-nine thousand, six hundred eighty-nine".