23561015 has 4 divisors (see below), whose sum is σ = 28273224. Its totient is φ = 18848808.

The previous prime is 23560973. The next prime is 23561017. The reversal of 23561015 is 51016532.

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

It is a cyclic number.

It is not a de Polignac number, because 23561015 - 2¹⁸ = 23298871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23561017) 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, 2356097 + ... + 2356106.

It is an arithmetic number, because the mean of its divisors is an integer number (7068306).

Almost surely, 2^23561015 is an apocalyptic number.

23561015 is a deficient number, since it is larger than the sum of its proper divisors (4712209).

23561015 is an equidigital number, since it uses as much as digits as its factorization.

23561015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4712208.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 23561015 is about 4853.9689945446. The cubic root of 23561015 is about 286.6803979061.

Adding to 23561015 its reverse (51016532), we get a palindrome (74577547).

The spelling of 23561015 in words is "twenty-three million, five hundred sixty-one thousand, fifteen".