116115781 has 4 divisors (see below), whose sum is σ = 118816192. Its totient is φ = 113415372.

The previous prime is 116115773. The next prime is 116115809. The reversal of 116115781 is 187511611.

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: 187511611 = 7 ⋅26787373.

It is a cyclic number.

It is not a de Polignac number, because 116115781 - 2³ = 116115773 is a prime.

It is a super-2 number, since 2×116115781² = 26965749194479922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116115281) 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, 1350141 + ... + 1350226.

It is an arithmetic number, because the mean of its divisors is an integer number (29704048).

Almost surely, 2^116115781 is an apocalyptic number.

It is an amenable number.

116115781 is a deficient number, since it is larger than the sum of its proper divisors (2700411).

116115781 is an equidigital number, since it uses as much as digits as its factorization.

116115781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700410.

The product of its digits is 1680, while the sum is 31.

The square root of 116115781 is about 10775.7032717127. The cubic root of 116115781 is about 487.8621018702.

The spelling of 116115781 in words is "one hundred sixteen million, one hundred fifteen thousand, seven hundred eighty-one".