116918981 has 8 divisors (see below), whose sum is σ = 121459800. Its totient is φ = 112412160.

The previous prime is 116918969. The next prime is 116918983. The reversal of 116918981 is 189819611.

It can be written as a sum of positive squares in 4 ways, for example, as 38950081 + 77968900 = 6241^2 + 8830^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-116918981 is a prime.

It is a super-2 number, since 2×116918981² = 27340096236156722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116918983) 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 7 ways as a sum of consecutive naturals, for example, 1376 + ... + 15353.

It is an arithmetic number, because the mean of its divisors is an integer number (15182475).

Almost surely, 2^116918981 is an apocalyptic number.

It is an amenable number.

116918981 is a deficient number, since it is larger than the sum of its proper divisors (4540819).

116918981 is a wasteful number, since it uses less digits than its factorization.

116918981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16999.

The product of its digits is 31104, while the sum is 44.

The square root of 116918981 is about 10812.9080732243. The cubic root of 116918981 is about 488.9844034933.

The spelling of 116918981 in words is "one hundred sixteen million, nine hundred eighteen thousand, nine hundred eighty-one".