23849561 has 4 divisors (see below), whose sum is σ = 23860452. Its totient is φ = 23838672.

The previous prime is 23849537. The next prime is 23849569. The reversal of 23849561 is 16594832.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8880400 + 14969161 = 2980^2 + 3869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23849561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23849569) 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, 890 + ... + 6963.

It is an arithmetic number, because the mean of its divisors is an integer number (5965113).

Almost surely, 2^23849561 is an apocalyptic number.

It is an amenable number.

23849561 is a deficient number, since it is larger than the sum of its proper divisors (10891).

23849561 is an equidigital number, since it uses as much as digits as its factorization.

23849561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10890.

The product of its digits is 51840, while the sum is 38.

The square root of 23849561 is about 4883.6012326970. The cubic root of 23849561 is about 287.8459543020.

The spelling of 23849561 in words is "twenty-three million, eight hundred forty-nine thousand, five hundred sixty-one".