816613 has 8 divisors (see below), whose sum is σ = 955328. Its totient is φ = 683424.

The previous prime is 816593. The next prime is 816649. The reversal of 816613 is 316618.

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

It is not a de Polignac number, because 816613 - 2⁵ = 816581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816653) 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, 1056 + ... + 1657.

It is an arithmetic number, because the mean of its divisors is an integer number (119416).

2⁸¹⁶⁶¹³ is an apocalyptic number.

It is an amenable number.

816613 is a deficient number, since it is larger than the sum of its proper divisors (138715).

816613 is a wasteful number, since it uses less digits than its factorization.

816613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763.

The product of its digits is 864, while the sum is 25.

The square root of 816613 is about 903.6664207549. Note that the first 3 decimals coincide. The cubic root of 816613 is about 93.4699685263.

The spelling of 816613 in words is "eight hundred sixteen thousand, six hundred thirteen".