115813 has 4 divisors (see below), whose sum is σ = 116640. Its totient is φ = 114988.

The previous prime is 115811. The next prime is 115823. The reversal of 115813 is 318511.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 318511 = 233 ⋅1367.

It is a cyclic number.

It is not a de Polignac number, because 115813 - 2¹ = 115811 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115811) 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, 145 + ... + 502.

It is an arithmetic number, because the mean of its divisors is an integer number (29160).

2¹¹⁵⁸¹³ is an apocalyptic number.

It is an amenable number.

115813 is a deficient number, since it is larger than the sum of its proper divisors (827).

115813 is an equidigital number, since it uses as much as digits as its factorization.

115813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826.

The product of its digits is 120, while the sum is 19.

The square root of 115813 is about 340.3130911381. The cubic root of 115813 is about 48.7437686535.

It can be divided in two parts, 11581 and 3, that multiplied together give a palindrome (34743).

The spelling of 115813 in words is "one hundred fifteen thousand, eight hundred thirteen".