23016561 has 8 divisors (see below), whose sum is σ = 30823680. Its totient is φ = 15276912.

The previous prime is 23016559. The next prime is 23016599. The reversal of 23016561 is 16561032.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23016561 - 2¹ = 23016559 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (23016541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16065 + ... + 17438.

It is an arithmetic number, because the mean of its divisors is an integer number (3852960).

Almost surely, 2^23016561 is an apocalyptic number.

It is an amenable number.

23016561 is a deficient number, since it is larger than the sum of its proper divisors (7807119).

23016561 is a wasteful number, since it uses less digits than its factorization.

23016561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33735.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 23016561 is about 4797.5578162227. The cubic root of 23016561 is about 284.4549385381.

Adding to 23016561 its reverse (16561032), we get a palindrome (39577593).

The spelling of 23016561 in words is "twenty-three million, sixteen thousand, five hundred sixty-one".