23135561 has 2 divisors, whose sum is σ = 23135562. Its totient is φ = 23135560.

The previous prime is 23135557. The next prime is 23135599. The reversal of 23135561 is 16553132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22705225 + 430336 = 4765^2 + 656^2 .

It is a cyclic number.

It is not a de Polignac number, because 23135561 - 2² = 23135557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23135561.

It is not a weakly prime, because it can be changed into another prime (23135501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11567780 + 11567781.

It is an arithmetic number, because the mean of its divisors is an integer number (11567781).

Almost surely, 2^23135561 is an apocalyptic number.

It is an amenable number.

23135561 is a deficient number, since it is larger than the sum of its proper divisors (1).

23135561 is an equidigital number, since it uses as much as digits as its factorization.

23135561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 26.

The square root of 23135561 is about 4809.9439705676. The cubic root of 23135561 is about 284.9443248175.

Adding to 23135561 its reverse (16553132), we get a palindrome (39688693).

The spelling of 23135561 in words is "twenty-three million, one hundred thirty-five thousand, five hundred sixty-one".