813165 has 16 divisors (see below), whose sum is σ = 1358208. Its totient is φ = 414656.

The previous prime is 813157. The next prime is 813167. The reversal of 813165 is 561318.

813165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 813165 - 2³ = 813157 is a prime.

It is a super-2 number, since 2×813165² = 1322474634450, which contains 22 as substring.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 834 + ... + 1523.

It is an arithmetic number, because the mean of its divisors is an integer number (84888).

2⁸¹³¹⁶⁵ is an apocalyptic number.

It is an amenable number.

813165 is a deficient number, since it is larger than the sum of its proper divisors (545043).

813165 is a wasteful number, since it uses less digits than its factorization.

813165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2388.

The product of its digits is 720, while the sum is 24.

The square root of 813165 is about 901.7566190497. The cubic root of 813165 is about 93.3382296184.

The spelling of 813165 in words is "eight hundred thirteen thousand, one hundred sixty-five".