816617 has 4 divisors (see below), whose sum is σ = 819540. Its totient is φ = 813696.

The previous prime is 816593. The next prime is 816649. The reversal of 816617 is 716618.

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 137641 + 678976 = 371^2 + 824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 816617.

It is not an unprimeable number, because it can be changed into a prime (816667) 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, 992 + ... + 1617.

It is an arithmetic number, because the mean of its divisors is an integer number (204885).

2⁸¹⁶⁶¹⁷ is an apocalyptic number.

It is an amenable number.

816617 is a deficient number, since it is larger than the sum of its proper divisors (2923).

816617 is a wasteful number, since it uses less digits than its factorization.

816617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2922.

The product of its digits is 2016, while the sum is 29.

The square root of 816617 is about 903.6686339583. The cubic root of 816617 is about 93.4701211401.

Subtracting from 816617 its reverse (716618), we obtain a palindrome (99999).

The spelling of 816617 in words is "eight hundred sixteen thousand, six hundred seventeen".