23440513 has 2 divisors, whose sum is σ = 23440514. Its totient is φ = 23440512.

The previous prime is 23440511. The next prime is 23440537. The reversal of 23440513 is 31504432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18722929 + 4717584 = 4327^2 + 2172^2 .

It is a cyclic number.

It is not a de Polignac number, because 23440513 - 2¹ = 23440511 is a prime.

Together with 23440511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23440511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11720256 + 11720257.

It is an arithmetic number, because the mean of its divisors is an integer number (11720257).

Almost surely, 2^23440513 is an apocalyptic number.

It is an amenable number.

23440513 is a deficient number, since it is larger than the sum of its proper divisors (1).

23440513 is an equidigital number, since it uses as much as digits as its factorization.

23440513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 23440513 is about 4841.5403540609. The cubic root of 23440513 is about 286.1908233094.

Adding to 23440513 its reverse (31504432), we get a palindrome (54944945).

The spelling of 23440513 in words is "twenty-three million, four hundred forty thousand, five hundred thirteen".