23111161 has 4 divisors (see below), whose sum is σ = 23323300. Its totient is φ = 22899024.

The previous prime is 23111149. The next prime is 23111183. The reversal of 23111161 is 16111132.

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 8526400 + 14584761 = 2920^2 + 3819^2 .

It is a cyclic number.

It is not a de Polignac number, because 23111161 - 2⁹ = 23110649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23111261) 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 3 ways as a sum of consecutive naturals, for example, 105906 + ... + 106123.

It is an arithmetic number, because the mean of its divisors is an integer number (5830825).

Almost surely, 2^23111161 is an apocalyptic number.

It is an amenable number.

23111161 is a deficient number, since it is larger than the sum of its proper divisors (212139).

23111161 is a wasteful number, since it uses less digits than its factorization.

23111161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212138.

The product of its digits is 36, while the sum is 16.

The square root of 23111161 is about 4807.4068893739. The cubic root of 23111161 is about 284.8441170728.

Adding to 23111161 its reverse (16111132), we get a palindrome (39222293).

The spelling of 23111161 in words is "twenty-three million, one hundred eleven thousand, one hundred sixty-one".