23281563 has 16 divisors (see below), whose sum is σ = 31997952. Its totient is φ = 15048000.

The previous prime is 23281553. The next prime is 23281567. The reversal of 23281563 is 36518232.

It is not a de Polignac number, because 23281563 - 2⁶ = 23281499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23281563.

It is not an unprimeable number, because it can be changed into a prime (23281567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22998 + ... + 23988.

It is an arithmetic number, because the mean of its divisors is an integer number (1999872).

Almost surely, 2^23281563 is an apocalyptic number.

23281563 is a deficient number, since it is larger than the sum of its proper divisors (8716389).

23281563 is a wasteful number, since it uses less digits than its factorization.

23281563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226.

The product of its digits is 8640, while the sum is 30.

The square root of 23281563 is about 4825.0972010935. The cubic root of 23281563 is about 285.5424694240.

Adding to 23281563 its reverse (36518232), we get a palindrome (59799795).

The spelling of 23281563 in words is "twenty-three million, two hundred eighty-one thousand, five hundred sixty-three".