115811 has 2 divisors, whose sum is σ = 115812. Its totient is φ = 115810.

The previous prime is 115807. The next prime is 115823. The reversal of 115811 is 118511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 115811 - 2² = 115807 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 115811.

It is not a weakly prime, because it can be changed into another prime (115831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57905 + 57906.

It is an arithmetic number, because the mean of its divisors is an integer number (57906).

2¹¹⁵⁸¹¹ is an apocalyptic number.

115811 is a deficient number, since it is larger than the sum of its proper divisors (1).

115811 is an equidigital number, since it uses as much as digits as its factorization.

115811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40, while the sum is 17.

The square root of 115811 is about 340.3101526549. The cubic root of 115811 is about 48.7434880629.

The spelling of 115811 in words is "one hundred fifteen thousand, eight hundred eleven".