817039049 has 4 divisors (see below), whose sum is σ = 818475540. Its totient is φ = 815602560.

The previous prime is 817039019. The next prime is 817039073. The reversal of 817039049 is 940930718.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 233478400 + 583560649 = 15280^2 + 24157^2 .

It is a cyclic number.

It is not a de Polignac number, because 817039049 - 2¹⁶ = 816973513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 817038997 and 817039015.

It is not an unprimeable number, because it can be changed into a prime (817039019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 717392 + ... + 718529.

It is an arithmetic number, because the mean of its divisors is an integer number (204618885).

Almost surely, 2^817039049 is an apocalyptic number.

It is an amenable number.

817039049 is a deficient number, since it is larger than the sum of its proper divisors (1436491).

817039049 is a wasteful number, since it uses less digits than its factorization.

817039049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436490.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 817039049 is about 28583.8949235404. The cubic root of 817039049 is about 934.8622096700.

The spelling of 817039049 in words is "eight hundred seventeen million, thirty-nine thousand, forty-nine".