23505145 has 4 divisors (see below), whose sum is σ = 28206180. Its totient is φ = 18804112.

The previous prime is 23505143. The next prime is 23505173. The reversal of 23505145 is 54150532.

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 12981609 + 10523536 = 3603^2 + 3244^2 .

It is a cyclic number.

It is not a de Polignac number, because 23505145 - 2¹ = 23505143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23505143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2350510 + ... + 2350519.

It is an arithmetic number, because the mean of its divisors is an integer number (7051545).

Almost surely, 2^23505145 is an apocalyptic number.

It is an amenable number.

23505145 is a deficient number, since it is larger than the sum of its proper divisors (4701035).

23505145 is an equidigital number, since it uses as much as digits as its factorization.

23505145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4701034.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 23505145 is about 4848.2104946052. The cubic root of 23505145 is about 286.4536177677.

Adding to 23505145 its reverse (54150532), we get a palindrome (77655677).

The spelling of 23505145 in words is "twenty-three million, five hundred five thousand, one hundred forty-five".