813211530 has 64 divisors (see below), whose sum is σ = 2069203968. Its totient is φ = 204180480.

The previous prime is 813211523. The next prime is 813211549. The reversal of 813211530 is 35112318.

813211530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×813211530² = 1322625985049881800, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 813211530.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22594 + ... + 46226.

It is an arithmetic number, because the mean of its divisors is an integer number (32331312).

Almost surely, 2^813211530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 813211530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1034601984).

813211530 is an abundant number, since it is smaller than the sum of its proper divisors (1255992438).

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

813211530 is a wasteful number, since it uses less digits than its factorization.

813211530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23711.

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

The square root of 813211530 is about 28516.8639580161. The cubic root of 813211530 is about 933.4000988236.

Adding to 813211530 its reverse (35112318), we get a palindrome (848323848).

The spelling of 813211530 in words is "eight hundred thirteen million, two hundred eleven thousand, five hundred thirty".