813156 has 12 divisors (see below), whose sum is σ = 1897392. Its totient is φ = 271048.

The previous prime is 813133. The next prime is 813157. The reversal of 813156 is 651318.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×813156² = 1322445360672, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 33870 + ... + 33893.

It is an arithmetic number, because the mean of its divisors is an integer number (158116).

2⁸¹³¹⁵⁶ is an apocalyptic number.

It is an amenable number.

813156 is an abundant number, since it is smaller than the sum of its proper divisors (1084236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

813156 is a wasteful number, since it uses less digits than its factorization.

813156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67770 (or 67768 counting only the distinct ones).

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

The square root of 813156 is about 901.7516287759. The cubic root of 813156 is about 93.3378852655.

It can be divided in two parts, 813 and 156, that added together give a palindrome (969).

The spelling of 813156 in words is "eight hundred thirteen thousand, one hundred fifty-six".