813155 has 12 divisors (see below), whose sum is σ = 1135440. Its totient is φ = 557424.

The previous prime is 813133. The next prime is 813157. The reversal of 813155 is 551318.

It is not a de Polignac number, because 813155 - 2⁶ = 813091 is a prime.

It is a super-2 number, since 2×813155² = 1322442108050, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 813155.

It is not an unprimeable number, because it can be changed into a prime (813157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1415 + ... + 1904.

It is an arithmetic number, because the mean of its divisors is an integer number (94620).

2⁸¹³¹⁵⁵ is an apocalyptic number.

813155 is a deficient number, since it is larger than the sum of its proper divisors (322285).

813155 is a wasteful number, since it uses less digits than its factorization.

813155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3338 (or 3331 counting only the distinct ones).

The product of its digits is 600, while the sum is 23.

The square root of 813155 is about 901.7510742993. The cubic root of 813155 is about 93.3378470039.

The spelling of 813155 in words is "eight hundred thirteen thousand, one hundred fifty-five".