115561281 has 16 divisors (see below), whose sum is σ = 169322688. Its totient is φ = 69523200.

The previous prime is 115561231. The next prime is 115561289. The reversal of 115561281 is 182165511.

It is not a de Polignac number, because 115561281 - 2⁶ = 115561217 is a prime.

It is a super-2 number, since 2×115561281² = 26708819332721922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (115561289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8260 + ... + 17301.

It is an arithmetic number, because the mean of its divisors is an integer number (10582668).

Almost surely, 2^115561281 is an apocalyptic number.

115561281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

115561281 is a deficient number, since it is larger than the sum of its proper divisors (53761407).

115561281 is a wasteful number, since it uses less digits than its factorization.

115561281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25712.

The product of its digits is 2400, while the sum is 30.

The square root of 115561281 is about 10749.9433021761. The cubic root of 115561281 is about 487.0842825455.

The spelling of 115561281 in words is "one hundred fifteen million, five hundred sixty-one thousand, two hundred eighty-one".