492739561 has 8 divisors (see below), whose sum is σ = 499905224. Its totient is φ = 485585280.

The previous prime is 492739549. The next prime is 492739567. The reversal of 492739561 is 165937294.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2958400 + 489781161 = 1720^2 + 22131^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 492739561 - 2¹¹ = 492737513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (492739567) 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 in 7 ways as a sum of consecutive naturals, for example, 125155 + ... + 129031.

It is an arithmetic number, because the mean of its divisors is an integer number (62488153).

Almost surely, 2^492739561 is an apocalyptic number.

It is an amenable number.

492739561 is a deficient number, since it is larger than the sum of its proper divisors (7165663).

492739561 is a wasteful number, since it uses less digits than its factorization.

492739561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5691.

The product of its digits is 408240, while the sum is 46.

The square root of 492739561 is about 22197.7377450947. The cubic root of 492739561 is about 789.8400365111.

The spelling of 492739561 in words is "four hundred ninety-two million, seven hundred thirty-nine thousand, five hundred sixty-one".