23567561 has 4 divisors (see below), whose sum is σ = 23620500. Its totient is φ = 23514624.

The previous prime is 23567521. The next prime is 23567567. The reversal of 23567561 is 16576532.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8791225 + 14776336 = 2965^2 + 3844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23567561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23567567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25796 + ... + 26693.

It is an arithmetic number, because the mean of its divisors is an integer number (5905125).

Almost surely, 2^23567561 is an apocalyptic number.

It is an amenable number.

23567561 is a deficient number, since it is larger than the sum of its proper divisors (52939).

23567561 is an equidigital number, since it uses as much as digits as its factorization.

23567561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52938.

The product of its digits is 37800, while the sum is 35.

The square root of 23567561 is about 4854.6432412691. The cubic root of 23567561 is about 286.7069450945.

The spelling of 23567561 in words is "twenty-three million, five hundred sixty-seven thousand, five hundred sixty-one".