813129 has 4 divisors (see below), whose sum is σ = 1084176. Its totient is φ = 542084.

The previous prime is 813121. The next prime is 813133. The reversal of 813129 is 921318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 813129 - 2³ = 813121 is a prime.

It is a super-2 number, since 2×813129² = 1322357541282, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

813129 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 813099 and 813108.

It is not an unprimeable number, because it can be changed into a prime (813121) 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, 135519 + ... + 135524.

It is an arithmetic number, because the mean of its divisors is an integer number (271044).

2⁸¹³¹²⁹ is an apocalyptic number.

It is an amenable number.

813129 is a deficient number, since it is larger than the sum of its proper divisors (271047).

813129 is a wasteful number, since it uses less digits than its factorization.

813129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271046.

The product of its digits is 432, while the sum is 24.

The square root of 813129 is about 901.7366577887. The cubic root of 813129 is about 93.3368521916.

The spelling of 813129 in words is "eight hundred thirteen thousand, one hundred twenty-nine".