813109 has 8 divisors (see below), whose sum is σ = 893952. Its totient is φ = 733440.

The previous prime is 813107. The next prime is 813121. The reversal of 813109 is 901318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 813109 - 2¹ = 813107 is a prime.

It is a super-2 number, since 2×813109² = 1322292491762, which contains 22 as substring.

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 813109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1932 + ... + 2314.

It is an arithmetic number, because the mean of its divisors is an integer number (111744).

2⁸¹³¹⁰⁹ is an apocalyptic number.

It is an amenable number.

813109 is a deficient number, since it is larger than the sum of its proper divisors (80843).

813109 is a wasteful number, since it uses less digits than its factorization.

813109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 813109 is about 901.7255680084. The cubic root of 813109 is about 93.3360869369.

Subtracting 813109 from its reverse (901318), we obtain a square (88209 = 297²).

The spelling of 813109 in words is "eight hundred thirteen thousand, one hundred nine".