23181145 has 16 divisors (see below), whose sum is σ = 30385152. Its totient is φ = 16873920.

The previous prime is 23181133. The next prime is 23181161. The reversal of 23181145 is 54118132.

It is not a de Polignac number, because 23181145 - 2⁷ = 23181017 is a prime.

It is a super-2 number, since 2×23181145² = 1074730967022050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2104 + ... + 7126.

It is an arithmetic number, because the mean of its divisors is an integer number (1899072).

Almost surely, 2^23181145 is an apocalyptic number.

It is an amenable number.

23181145 is a deficient number, since it is larger than the sum of its proper divisors (7204007).

23181145 is a wasteful number, since it uses less digits than its factorization.

23181145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5112.

The product of its digits is 960, while the sum is 25.

The square root of 23181145 is about 4814.6801555244. The cubic root of 23181145 is about 285.1313439947.

Adding to 23181145 its reverse (54118132), we get a palindrome (77299277).

The spelling of 23181145 in words is "twenty-three million, one hundred eighty-one thousand, one hundred forty-five".