115969 has 4 divisors (see below), whose sum is σ = 132544. Its totient is φ = 99396.

The previous prime is 115963. The next prime is 115979. The reversal of 115969 is 969511.

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 an emirpimes, since its reverse is a distinct semiprime: 969511 = 37 ⋅26203.

It is a cyclic number.

It is not a de Polignac number, because 115969 - 2¹¹ = 113921 is a prime.

It is a super-2 number, since 2×115969² = 26897617922, which contains 22 as substring.

It is a Duffinian number.

115969 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 115969.

It is not an unprimeable number, because it can be changed into a prime (115963) 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, 8277 + ... + 8290.

It is an arithmetic number, because the mean of its divisors is an integer number (33136).

2¹¹⁵⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

115969 is a deficient number, since it is larger than the sum of its proper divisors (16575).

115969 is an equidigital number, since it uses as much as digits as its factorization.

115969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16574.

The product of its digits is 2430, while the sum is 31.

The square root of 115969 is about 340.5422147106. The cubic root of 115969 is about 48.7656447706.

The spelling of 115969 in words is "one hundred fifteen thousand, nine hundred sixty-nine".