23129569 has 2 divisors, whose sum is σ = 23129570. Its totient is φ = 23129568.

The previous prime is 23129563. The next prime is 23129591. The reversal of 23129569 is 96592132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22657600 + 471969 = 4760^2 + 687^2 .

It is a cyclic number.

It is not a de Polignac number, because 23129569 - 2¹¹ = 23127521 is a prime.

It is a super-2 number, since 2×23129569² = 1069953924251522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23129563) 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, 11564784 + 11564785.

It is an arithmetic number, because the mean of its divisors is an integer number (11564785).

Almost surely, 2^23129569 is an apocalyptic number.

It is an amenable number.

23129569 is a deficient number, since it is larger than the sum of its proper divisors (1).

23129569 is an equidigital number, since it uses as much as digits as its factorization.

23129569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 37.

The square root of 23129569 is about 4809.3210539535. The cubic root of 23129569 is about 284.9197229529.

It can be divided in two parts, 2312 and 9569, that added together give a square (11881 = 109²).

The spelling of 23129569 in words is "twenty-three million, one hundred twenty-nine thousand, five hundred sixty-nine".