23561013 has 20 divisors (see below), whose sum is σ = 36659488. Its totient is φ = 13459320.

The previous prime is 23560973. The next prime is 23561017. The reversal of 23561013 is 31016532.

It is not a de Polignac number, because 23561013 - 2⁶ = 23560949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 6.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5568 + ... + 8838.

Almost surely, 2^23561013 is an apocalyptic number.

It is an amenable number.

23561013 is a deficient number, since it is larger than the sum of its proper divisors (13098475).

23561013 is an frugal number, since it uses more digits than its factorization.

23561013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3302 (or 3281 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 23561013 is about 4853.9687885276. The cubic root of 23561013 is about 286.6803897943.

Adding to 23561013 its reverse (31016532), we get a palindrome (54577545).

The spelling of 23561013 in words is "twenty-three million, five hundred sixty-one thousand, thirteen".