813135729 has 16 divisors (see below), whose sum is σ = 1239469952. Its totient is φ = 464496768.

The previous prime is 813135707. The next prime is 813135737. The reversal of 813135729 is 927531318.

It is not a de Polignac number, because 813135729 - 2⁸ = 813135473 is a prime.

It is a super-2 number, since 2×813135729² = 1322379427552722882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (813135529) 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, 103587 + ... + 111159.

It is an arithmetic number, because the mean of its divisors is an integer number (77466872).

Almost surely, 2^813135729 is an apocalyptic number.

It is an amenable number.

813135729 is a deficient number, since it is larger than the sum of its proper divisors (426334223).

813135729 is a wasteful number, since it uses less digits than its factorization.

813135729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12696.

The product of its digits is 45360, while the sum is 39.

The square root of 813135729 is about 28515.5348713644. The cubic root of 813135729 is about 933.3710965871.

The spelling of 813135729 in words is "eight hundred thirteen million, one hundred thirty-five thousand, seven hundred twenty-nine".