116281981 has 4 divisors (see below), whose sum is σ = 116304700. Its totient is φ = 116259264.

The previous prime is 116281943. The next prime is 116281993. The reversal of 116281981 is 189182611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85932900 + 30349081 = 9270^2 + 5509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-116281981 is a prime.

It is a super-2 number, since 2×116281981² = 27042998210568722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 116281981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116281931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325 + ... + 15253.

It is an arithmetic number, because the mean of its divisors is an integer number (29076175).

Almost surely, 2^116281981 is an apocalyptic number.

It is an amenable number.

116281981 is a deficient number, since it is larger than the sum of its proper divisors (22719).

116281981 is an equidigital number, since it uses as much as digits as its factorization.

116281981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22718.

The product of its digits is 6912, while the sum is 37.

The square root of 116281981 is about 10783.4123077994. The cubic root of 116281981 is about 488.0947547908.

The spelling of 116281981 in words is "one hundred sixteen million, two hundred eighty-one thousand, nine hundred eighty-one".