23042513 has 4 divisors (see below), whose sum is σ = 24815028. Its totient is φ = 21270000.

The previous prime is 23042479. The next prime is 23042561. The reversal of 23042513 is 31524032.

It is a happy number.

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 5166529 + 17875984 = 2273^2 + 4228^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23042513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23042213) 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, 886238 + ... + 886263.

It is an arithmetic number, because the mean of its divisors is an integer number (6203757).

Almost surely, 2^23042513 is an apocalyptic number.

It is an amenable number.

23042513 is a deficient number, since it is larger than the sum of its proper divisors (1772515).

23042513 is a wasteful number, since it uses less digits than its factorization.

23042513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772514.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 23042513 is about 4800.2617636958. The cubic root of 23042513 is about 284.5618094378.

Adding to 23042513 its reverse (31524032), we get a palindrome (54566545).

The spelling of 23042513 in words is "twenty-three million, forty-two thousand, five hundred thirteen".