23505161 has 4 divisors (see below), whose sum is σ = 24263424. Its totient is φ = 22746900.

The previous prime is 23505143. The next prime is 23505173. The reversal of 23505161 is 16150532.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23505161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23505061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379085 + ... + 379146.

It is an arithmetic number, because the mean of its divisors is an integer number (6065856).

Almost surely, 2^23505161 is an apocalyptic number.

It is an amenable number.

23505161 is a deficient number, since it is larger than the sum of its proper divisors (758263).

23505161 is an equidigital number, since it uses as much as digits as its factorization.

23505161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758262.

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

The square root of 23505161 is about 4848.2121446983. The cubic root of 23505161 is about 286.4536827642.

Adding to 23505161 its reverse (16150532), we get a palindrome (39655693).

The spelling of 23505161 in words is "twenty-three million, five hundred five thousand, one hundred sixty-one".