113305781 has 2 divisors, whose sum is σ = 113305782. Its totient is φ = 113305780.

The previous prime is 113305771. The next prime is 113305789. The reversal of 113305781 is 187503311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58767556 + 54538225 = 7666^2 + 7385^2 .

It is an emirp because it is prime and its reverse (187503311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113305781 - 2¹⁰ = 113304757 is a prime.

It is a super-2 number, since 2×113305781² = 25676400016039922, 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 (113305789) 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, 56652890 + 56652891.

It is an arithmetic number, because the mean of its divisors is an integer number (56652891).

Almost surely, 2^113305781 is an apocalyptic number.

It is an amenable number.

113305781 is a deficient number, since it is larger than the sum of its proper divisors (1).

113305781 is an equidigital number, since it uses as much as digits as its factorization.

113305781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 113305781 is about 10644.5188242588. The cubic root of 113305781 is about 483.8945040772.

The spelling of 113305781 in words is "one hundred thirteen million, three hundred five thousand, seven hundred eighty-one".