113663981 has 2 divisors, whose sum is σ = 113663982. Its totient is φ = 113663980.

The previous prime is 113663951. The next prime is 113663983. The reversal of 113663981 is 189366311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102839881 + 10824100 = 10141^2 + 3290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113663981 is a prime.

It is a super-2 number, since 2×113663981² = 25839001153536722, which contains 22 as substring.

Together with 113663983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113663983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56831990 + 56831991.

It is an arithmetic number, because the mean of its divisors is an integer number (56831991).

Almost surely, 2^113663981 is an apocalyptic number.

It is an amenable number.

113663981 is a deficient number, since it is larger than the sum of its proper divisors (1).

113663981 is an equidigital number, since it uses as much as digits as its factorization.

113663981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 113663981 is about 10661.3311082622. The cubic root of 113663981 is about 484.4038887300.

The spelling of 113663981 in words is "one hundred thirteen million, six hundred sixty-three thousand, nine hundred eighty-one".