113218561 has 2 divisors, whose sum is σ = 113218562. Its totient is φ = 113218560.

The previous prime is 113218537. The next prime is 113218571. The reversal of 113218561 is 165812311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63600625 + 49617936 = 7975^2 + 7044^2 .

It is a cyclic number.

It is not a de Polignac number, because 113218561 - 2⁷ = 113218433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (113218531) 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, 56609280 + 56609281.

It is an arithmetic number, because the mean of its divisors is an integer number (56609281).

Almost surely, 2^113218561 is an apocalyptic number.

It is an amenable number.

113218561 is a deficient number, since it is larger than the sum of its proper divisors (1).

113218561 is an equidigital number, since it uses as much as digits as its factorization.

113218561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 28.

The square root of 113218561 is about 10640.4210912915. The cubic root of 113218561 is about 483.7703088465.

The spelling of 113218561 in words is "one hundred thirteen million, two hundred eighteen thousand, five hundred sixty-one".