492715721 has 2 divisors, whose sum is σ = 492715722. Its totient is φ = 492715720.

The previous prime is 492715697. The next prime is 492715723. The reversal of 492715721 is 127517294.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 306775225 + 185940496 = 17515^2 + 13636^2 .

It is a cyclic number.

It is not a de Polignac number, because 492715721 - 2¹⁰ = 492714697 is a prime.

Together with 492715723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (492715723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246357860 + 246357861.

It is an arithmetic number, because the mean of its divisors is an integer number (246357861).

Almost surely, 2^492715721 is an apocalyptic number.

It is an amenable number.

492715721 is a deficient number, since it is larger than the sum of its proper divisors (1).

492715721 is an equidigital number, since it uses as much as digits as its factorization.

492715721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 38.

The square root of 492715721 is about 22197.2007469410. The cubic root of 492715721 is about 789.8272981454.

The spelling of 492715721 in words is "four hundred ninety-two million, seven hundred fifteen thousand, seven hundred twenty-one".