115511 has 4 divisors (see below), whose sum is σ = 126024. Its totient is φ = 105000.

The previous prime is 115499. The next prime is 115513.

115511 is nontrivially palindromic in base 10.

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 115511 - 2¹⁰ = 114487 is a prime.

It is a super-2 number, since 2×115511² = 26685582242, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115513) 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, 5240 + ... + 5261.

It is an arithmetic number, because the mean of its divisors is an integer number (31506).

2¹¹⁵⁵¹¹ is an apocalyptic number.

115511 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

115511 is a deficient number, since it is larger than the sum of its proper divisors (10513).

115511 is a wasteful number, since it uses less digits than its factorization.

115511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10512.

The product of its digits is 25, while the sum is 14.

The square root of 115511 is about 339.8690924459. The cubic root of 115511 is about 48.7013628437.

It can be divided in two parts, 115 and 511, that added together give a palindrome (626).

The spelling of 115511 in words is "one hundred fifteen thousand, five hundred eleven".