813166 has 4 divisors (see below), whose sum is σ = 1219752. Its totient is φ = 406582.

The previous prime is 813157. The next prime is 813167. The reversal of 813166 is 661318.

813166 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.

It is a super-2 number, since 2×813166² = 1322477887112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 813166.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813166.

It is not an unprimeable number, because it can be changed into a prime (813167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203290 + ... + 203293.

It is an arithmetic number, because the mean of its divisors is an integer number (304938).

2⁸¹³¹⁶⁶ is an apocalyptic number.

813166 is a deficient number, since it is larger than the sum of its proper divisors (406586).

813166 is a wasteful number, since it uses less digits than its factorization.

813166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406585.

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

The square root of 813166 is about 901.7571735229. The cubic root of 813166 is about 93.3382678797.

It can be divided in two parts, 813 and 166, that added together give a palindrome (979).

The spelling of 813166 in words is "eight hundred thirteen thousand, one hundred sixty-six".