810523013 has 4 divisors (see below), whose sum is σ = 845763168. Its totient is φ = 775282860.

The previous prime is 810523009. The next prime is 810523031. The reversal of 810523013 is 310325018.

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 810523013 - 2² = 810523009 is a prime.

It is a super-3 number, since 3×810523013³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 35240131 = 810523013 / (8 + 1 + 0 + 5 + 2 + 3 + 0 + 1 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 810523013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810523003) 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, 17620043 + ... + 17620088.

It is an arithmetic number, because the mean of its divisors is an integer number (211440792).

Almost surely, 2^810523013 is an apocalyptic number.

It is an amenable number.

810523013 is a deficient number, since it is larger than the sum of its proper divisors (35240155).

810523013 is a wasteful number, since it uses less digits than its factorization.

810523013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35240154.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 810523013 is about 28469.6858605781. The cubic root of 810523013 is about 932.3703410877.

The spelling of 810523013 in words is "eight hundred ten million, five hundred twenty-three thousand, thirteen".