813143 has 4 divisors (see below), whose sum is σ = 855960. Its totient is φ = 770328.

The previous prime is 813133. The next prime is 813157. The reversal of 813143 is 341318.

It is a happy number.

813143 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 cyclic number.

It is not a de Polignac number, because 813143 - 2¹⁴ = 796759 is a prime.

It is a super-2 number, since 2×813143² = 1322403076898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813133) 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, 21380 + ... + 21417.

It is an arithmetic number, because the mean of its divisors is an integer number (213990).

2⁸¹³¹⁴³ is an apocalyptic number.

813143 is a deficient number, since it is larger than the sum of its proper divisors (42817).

813143 is a wasteful number, since it uses less digits than its factorization.

813143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42816.

The product of its digits is 288, while the sum is 20.

The square root of 813143 is about 901.7444205539. The cubic root of 813143 is about 93.3373878624.

The spelling of 813143 in words is "eight hundred thirteen thousand, one hundred forty-three".