23731145 has 4 divisors (see below), whose sum is σ = 28477380. Its totient is φ = 18984912.

The previous prime is 23731139. The next prime is 23731159. The reversal of 23731145 is 54113732.

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 12082576 + 11648569 = 3476^2 + 3413^2 .

It is a cyclic number.

It is not a de Polignac number, because 23731145 - 2⁴ = 23731129 is a prime.

It is a super-2 number, since 2×23731145² = 1126334486022050, which contains 22 as substring.

It is an unprimeable number.

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, 2373110 + ... + 2373119.

It is an arithmetic number, because the mean of its divisors is an integer number (7119345).

Almost surely, 2^23731145 is an apocalyptic number.

It is an amenable number.

23731145 is a deficient number, since it is larger than the sum of its proper divisors (4746235).

23731145 is an equidigital number, since it uses as much as digits as its factorization.

23731145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4746234.

The product of its digits is 2520, while the sum is 26.

The square root of 23731145 is about 4871.4623061253. The cubic root of 23731145 is about 287.3687668231.

Adding to 23731145 its reverse (54113732), we get a palindrome (77844877).

The spelling of 23731145 in words is "twenty-three million, seven hundred thirty-one thousand, one hundred forty-five".