816825017 has 4 divisors (see below), whose sum is σ = 819451776. Its totient is φ = 814198260.

The previous prime is 816825007. The next prime is 816825019. The reversal of 816825017 is 710528618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 816825017 - 2⁸ = 816824761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816825019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1312913 + ... + 1313534.

It is an arithmetic number, because the mean of its divisors is an integer number (204862944).

Almost surely, 2^816825017 is an apocalyptic number.

It is an amenable number.

816825017 is a deficient number, since it is larger than the sum of its proper divisors (2626759).

816825017 is a wasteful number, since it uses less digits than its factorization.

816825017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626758.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 816825017 is about 28580.1507518767. The cubic root of 816825017 is about 934.7805702008.

The spelling of 816825017 in words is "eight hundred sixteen million, eight hundred twenty-five thousand, seventeen".