115491 has 8 divisors (see below), whose sum is σ = 155664. Its totient is φ = 76160.

The previous prime is 115471. The next prime is 115499. The reversal of 115491 is 194511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 115491 - 2⁵ = 115459 is a prime.

115491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (115499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271 + ... + 551.

It is an arithmetic number, because the mean of its divisors is an integer number (19458).

2¹¹⁵⁴⁹¹ is an apocalyptic number.

115491 is a deficient number, since it is larger than the sum of its proper divisors (40173).

115491 is a wasteful number, since it uses less digits than its factorization.

115491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421.

The product of its digits is 180, while the sum is 21.

The square root of 115491 is about 339.8396680789. The cubic root of 115491 is about 48.6985519037.

It can be divided in two parts, 115 and 491, that multiplied together give a palindrome (56465).

The spelling of 115491 in words is "one hundred fifteen thousand, four hundred ninety-one".