115963891 has 4 divisors (see below), whose sum is σ = 116178784. Its totient is φ = 115749000.

The previous prime is 115963879. The next prime is 115963909. The reversal of 115963891 is 198369511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198369511 = 149 ⋅1331339.

It is a cyclic number.

It is not a de Polignac number, because 115963891 - 2¹⁷ = 115832819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115963871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106635 + ... + 107716.

It is an arithmetic number, because the mean of its divisors is an integer number (29044696).

Almost surely, 2^115963891 is an apocalyptic number.

115963891 is a deficient number, since it is larger than the sum of its proper divisors (214893).

115963891 is an equidigital number, since it uses as much as digits as its factorization.

115963891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214892.

The product of its digits is 58320, while the sum is 43.

The square root of 115963891 is about 10768.6531655542. The cubic root of 115963891 is about 487.6492863857.

The spelling of 115963891 in words is "one hundred fifteen million, nine hundred sixty-three thousand, eight hundred ninety-one".