113445581 has 2 divisors, whose sum is σ = 113445582. Its totient is φ = 113445580.

The previous prime is 113445571. The next prime is 113445583. The reversal of 113445581 is 185544311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110775625 + 2669956 = 10525^2 + 1634^2 .

It is a cyclic number.

It is not a de Polignac number, because 113445581 - 2¹⁰ = 113444557 is a prime.

It is a super-2 number, since 2×113445581² = 25739799696855122, which contains 22 as substring.

Together with 113445583, 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 (113445583) 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, 56722790 + 56722791.

It is an arithmetic number, because the mean of its divisors is an integer number (56722791).

Almost surely, 2^113445581 is an apocalyptic number.

It is an amenable number.

113445581 is a deficient number, since it is larger than the sum of its proper divisors (1).

113445581 is an equidigital number, since it uses as much as digits as its factorization.

113445581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 32.

The square root of 113445581 is about 10651.0835599013. The cubic root of 113445581 is about 484.0934366998.

Adding to 113445581 its reverse (185544311), we get a palindrome (298989892).

The spelling of 113445581 in words is "one hundred thirteen million, four hundred forty-five thousand, five hundred eighty-one".