115891777 has 4 divisors (see below), whose sum is σ = 115946496. Its totient is φ = 115837060.

The previous prime is 115891759. The next prime is 115891793. The reversal of 115891777 is 777198511.

It is a happy number.

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: 777198511 = 281 ⋅2765831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115891777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115891747) 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 3 ways as a sum of consecutive naturals, for example, 24049 + ... + 28462.

It is an arithmetic number, because the mean of its divisors is an integer number (28986624).

Almost surely, 2^115891777 is an apocalyptic number.

It is an amenable number.

115891777 is a deficient number, since it is larger than the sum of its proper divisors (54719).

115891777 is an equidigital number, since it uses as much as digits as its factorization.

115891777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54718.

The product of its digits is 123480, while the sum is 46.

The square root of 115891777 is about 10765.3043152528. The cubic root of 115891777 is about 487.5481812559.

It can be divided in two parts, 11589 and 1777, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 115891777 in words is "one hundred fifteen million, eight hundred ninety-one thousand, seven hundred seventy-seven".