113623600561 has 3 divisors (see below), whose sum is σ = 113623937643. Its totient is φ = 113623263480.

The previous prime is 113623600511. The next prime is 113623600577. The reversal of 113623600561 is 165006326311.

The square root of 113623600561 is 337081.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 165006326311 = 33829 ⋅4877659.

It can be written as a sum of positive squares in only one way, i.e., 81558961 + 113542041600 = 9031^2 + 336960^2 .

It is not a de Polignac number, because 113623600561 - 2⁹ = 113623600049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113623600501) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 168541 + ... + 505621.

It is an arithmetic number, because the mean of its divisors is an integer number (37874645881).

Almost surely, 2^113623600561 is an apocalyptic number.

113623600561 is the 337081-st square number.

113623600561 is the 168541-st centered octagonal number.

It is an amenable number.

113623600561 is a deficient number, since it is larger than the sum of its proper divisors (337082).

113623600561 is an frugal number, since it uses more digits than its factorization.

113623600561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674162 (or 337081 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

Adding to 113623600561 its reverse (165006326311), we get a palindrome (278629926872).

The spelling of 113623600561 in words is "one hundred thirteen billion, six hundred twenty-three million, six hundred thousand, five hundred sixty-one".