23111145 has 24 divisors (see below), whose sum is σ = 40177800. Its totient is φ = 12289536.

The previous prime is 23111119. The next prime is 23111149. The reversal of 23111145 is 54111132.

It can be written as a sum of positive squares in 4 ways, for example, as 3370896 + 19740249 = 1836^2 + 4443^2 .

It is not a de Polignac number, because 23111145 - 2²³ = 14722537 is a prime.

It is a super-2 number, since 2×23111145² = 1068250046422050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23111149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22401 + ... + 23409.

It is an arithmetic number, because the mean of its divisors is an integer number (1674075).

Almost surely, 2^23111145 is an apocalyptic number.

It is an amenable number.

23111145 is a deficient number, since it is larger than the sum of its proper divisors (17066655).

23111145 is a wasteful number, since it uses less digits than its factorization.

23111145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529 (or 1526 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 23111145 is about 4807.4052252749. The cubic root of 23111145 is about 284.8440513397.

Adding to 23111145 its reverse (54111132), we get a palindrome (77222277).

The spelling of 23111145 in words is "twenty-three million, one hundred eleven thousand, one hundred forty-five".