115819 has 4 divisors (see below), whose sum is σ = 126360. Its totient is φ = 105280.

The previous prime is 115811. The next prime is 115823. The reversal of 115819 is 918511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 115819 - 2³ = 115811 is a prime.

It is a super-2 number, since 2×115819² = 26828081522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115793 and 115802.

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, 5254 + ... + 5275.

It is an arithmetic number, because the mean of its divisors is an integer number (31590).

2¹¹⁵⁸¹⁹ is an apocalyptic number.

115819 is a deficient number, since it is larger than the sum of its proper divisors (10541).

115819 is a wasteful number, since it uses less digits than its factorization.

115819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10540.

The product of its digits is 360, while the sum is 25.

The square root of 115819 is about 340.3219064357. The cubic root of 115819 is about 48.7446104057.

It can be divided in two parts, 11 and 5819, that multiplied together give a square (64009 = 253²).

The spelling of 115819 in words is "one hundred fifteen thousand, eight hundred nineteen".