813099 has 16 divisors (see below), whose sum is σ = 1280000. Its totient is φ = 449280.
The previous prime is 813097. The next prime is 813107. The reversal of 813099 is 990318.
It is a happy number.
It is not a de Polignac number, because 813099 - 21 = 813097 is a prime.
It is a super-2 number, since 2×8130992 = 1322259967602, which contains 22 as substring.
It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (813091) 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, 27 + ... + 1275.
It is an arithmetic number, because the mean of its divisors is an integer number (80000).
2813099 is an apocalyptic number.
813099 is a deficient number, since it is larger than the sum of its proper divisors (466901).
813099 is a wasteful number, since it uses less digits than its factorization.
813099 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1290.
The product of its (nonzero) digits is 1944, while the sum is 30.
The square root of 813099 is about 901.7200230670. The cubic root of 813099 is about 93.3357043048.
It can be divided in two parts, 81309 and 9, that added together give a palindrome (81318).
The spelling of 813099 in words is "eight hundred thirteen thousand, ninety-nine".
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