113243981 has 2 divisors, whose sum is σ = 113243982. Its totient is φ = 113243980.

The previous prime is 113243959. The next prime is 113243989. The reversal of 113243981 is 189342311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99301225 + 13942756 = 9965^2 + 3734^2 .

It is a cyclic number.

It is not a de Polignac number, because 113243981 - 2¹⁸ = 112981837 is a prime.

It is a super-2 number, since 2×113243981² = 25648398465456722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113243989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56621990 + 56621991.

It is an arithmetic number, because the mean of its divisors is an integer number (56621991).

Almost surely, 2^113243981 is an apocalyptic number.

It is an amenable number.

113243981 is a deficient number, since it is larger than the sum of its proper divisors (1).

113243981 is an equidigital number, since it uses as much as digits as its factorization.

113243981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 113243981 is about 10641.6155258494. The cubic root of 113243981 is about 483.8065117474.

The spelling of 113243981 in words is "one hundred thirteen million, two hundred forty-three thousand, nine hundred eighty-one".