23113561 has 2 divisors, whose sum is σ = 23113562. Its totient is φ = 23113560.

The previous prime is 23113549. The next prime is 23113577. The reversal of 23113561 is 16531132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19193161 + 3920400 = 4381^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 23113561 - 2⁵ = 23113529 is a prime.

It is not a weakly prime, because it can be changed into another prime (23113501) 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, 11556780 + 11556781.

It is an arithmetic number, because the mean of its divisors is an integer number (11556781).

Almost surely, 2^23113561 is an apocalyptic number.

It is an amenable number.

23113561 is a deficient number, since it is larger than the sum of its proper divisors (1).

23113561 is an equidigital number, since it uses as much as digits as its factorization.

23113561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 22.

The square root of 23113561 is about 4807.6564977128. The cubic root of 23113561 is about 284.8539766989.

Adding to 23113561 its reverse (16531132), we get a palindrome (39644693).

The spelling of 23113561 in words is "twenty-three million, one hundred thirteen thousand, five hundred sixty-one".