811613 has 4 divisors (see below), whose sum is σ = 885408. Its totient is φ = 737820.

The previous prime is 811607. The next prime is 811619. The reversal of 811613 is 316118.

811613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (811607) and next prime (811619).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811613 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811619) 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, 36881 + ... + 36902.

It is an arithmetic number, because the mean of its divisors is an integer number (221352).

2⁸¹¹⁶¹³ is an apocalyptic number.

It is an amenable number.

811613 is a deficient number, since it is larger than the sum of its proper divisors (73795).

811613 is a wasteful number, since it uses less digits than its factorization.

811613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73794.

The product of its digits is 144, while the sum is 20.

The square root of 811613 is about 900.8956654352. The cubic root of 811613 is about 93.2788102753.

The spelling of 811613 in words is "eight hundred eleven thousand, six hundred thirteen".