23650561 has 16 divisors (see below), whose sum is σ = 26593920. Its totient is φ = 20849920.

The previous prime is 23650513. The next prime is 23650567. The reversal of 23650561 is 16505632.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23650561 is a prime.

It is a super-2 number, since 2×23650561² = 1118698071229442, which contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23650567) 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, 65700 + ... + 66058.

It is an arithmetic number, because the mean of its divisors is an integer number (1662120).

Almost surely, 2^23650561 is an apocalyptic number.

It is an amenable number.

23650561 is a deficient number, since it is larger than the sum of its proper divisors (2943359).

23650561 is a wasteful number, since it uses less digits than its factorization.

23650561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 23650561 is about 4863.1842449161. The cubic root of 23650561 is about 287.0431246330.

Subtracting from 23650561 its reverse (16505632), we obtain a square (7144929 = 2673²).

It can be divided in two parts, 2 and 3650561, that added together give a palindrome (3650563).

The spelling of 23650561 in words is "twenty-three million, six hundred fifty thousand, five hundred sixty-one".