113909981 has 2 divisors, whose sum is σ = 113909982. Its totient is φ = 113909980.

The previous prime is 113909969. The next prime is 113909993. The reversal of 113909981 is 189909311.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (113909969) and next prime (113909993).

It can be written as a sum of positive squares in only one way, i.e., 104244100 + 9665881 = 10210^2 + 3109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113909981 is a prime.

It is a super-2 number, since 2×113909981² = 25950967542840722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113909381) 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 as a sum of consecutive naturals, namely, 56954990 + 56954991.

It is an arithmetic number, because the mean of its divisors is an integer number (56954991).

Almost surely, 2^113909981 is an apocalyptic number.

It is an amenable number.

113909981 is a deficient number, since it is larger than the sum of its proper divisors (1).

113909981 is an equidigital number, since it uses as much as digits as its factorization.

113909981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 41.

The square root of 113909981 is about 10672.8618936066. The cubic root of 113909981 is about 484.7530978386.

The spelling of 113909981 in words is "one hundred thirteen million, nine hundred nine thousand, nine hundred eighty-one".