23011911 has 32 divisors (see below), whose sum is σ = 37437120. Its totient is φ = 13882752.

The previous prime is 23011909. The next prime is 23011921. The reversal of 23011911 is 11911032.

It is not a de Polignac number, because 23011911 - 2¹ = 23011909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23011921) 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 31 ways as a sum of consecutive naturals, for example, 17985 + ... + 19221.

It is an arithmetic number, because the mean of its divisors is an integer number (1169910).

Almost surely, 2^23011911 is an apocalyptic number.

23011911 is a deficient number, since it is larger than the sum of its proper divisors (14425209).

23011911 is a wasteful number, since it uses less digits than its factorization.

23011911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312 (or 1306 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 23011911 is about 4797.0731701737. The cubic root of 23011911 is about 284.4357812518.

Adding to 23011911 its reverse (11911032), we get a palindrome (34922943).

The spelling of 23011911 in words is "twenty-three million, eleven thousand, nine hundred eleven".