23309563 has 2 divisors, whose sum is σ = 23309564. Its totient is φ = 23309562.

The previous prime is 23309537. The next prime is 23309581. The reversal of 23309563 is 36590332.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23309563 is a prime.

It is not a weakly prime, because it can be changed into another prime (23309063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11654781 + 11654782.

It is an arithmetic number, because the mean of its divisors is an integer number (11654782).

Almost surely, 2^23309563 is an apocalyptic number.

23309563 is a deficient number, since it is larger than the sum of its proper divisors (1).

23309563 is an equidigital number, since it uses as much as digits as its factorization.

23309563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 31.

The square root of 23309563 is about 4827.9978251859. The cubic root of 23309563 is about 285.6568945322.

Adding to 23309563 its reverse (36590332), we get a palindrome (59899895).

The spelling of 23309563 in words is "twenty-three million, three hundred nine thousand, five hundred sixty-three".