817992041 has 8 divisors (see below), whose sum is σ = 840795144. Its totient is φ = 795225600.

The previous prime is 817992037. The next prime is 817992073. The reversal of 817992041 is 140299718.

It can be written as a sum of positive squares in 4 ways, for example, as 1690000 + 816302041 = 1300^2 + 28571^2 .

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 817992041 - 2² = 817992037 is a prime.

It is a super-2 number, since 2×817992041² = 1338221958278691362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 817992041.

It is not an unprimeable number, because it can be changed into a prime (817992001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39641 + ... + 56633.

It is an arithmetic number, because the mean of its divisors is an integer number (105099393).

Almost surely, 2^817992041 is an apocalyptic number.

It is an amenable number.

817992041 is a deficient number, since it is larger than the sum of its proper divisors (22803103).

817992041 is a wasteful number, since it uses less digits than its factorization.

817992041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18331.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 817992041 is about 28600.5601518572. The cubic root of 817992041 is about 935.2255419755.

The spelling of 817992041 in words is "eight hundred seventeen million, nine hundred ninety-two thousand, forty-one".