492715781 has 2 divisors, whose sum is σ = 492715782. Its totient is φ = 492715780.

The previous prime is 492715739. The next prime is 492715793. The reversal of 492715781 is 187517294.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 439279681 + 53436100 = 20959^2 + 7310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-492715781 is a prime.

It is a super-2 number, since 2×492715781² = 485537681692879922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (492715721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246357890 + 246357891.

It is an arithmetic number, because the mean of its divisors is an integer number (246357891).

Almost surely, 2^492715781 is an apocalyptic number.

It is an amenable number.

492715781 is a deficient number, since it is larger than the sum of its proper divisors (1).

492715781 is an equidigital number, since it uses as much as digits as its factorization.

492715781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 44.

The square root of 492715781 is about 22197.2020984628. The cubic root of 492715781 is about 789.8273302056.

The spelling of 492715781 in words is "four hundred ninety-two million, seven hundred fifteen thousand, seven hundred eighty-one".