65043813 has 4 divisors (see below), whose sum is σ = 86725088. Its totient is φ = 43362540.

The previous prime is 65043791. The next prime is 65043829. The reversal of 65043813 is 31834056.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65043813 - 2⁶ = 65043749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65043833) 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, 10840633 + ... + 10840638.

It is an arithmetic number, because the mean of its divisors is an integer number (21681272).

Almost surely, 2^65043813 is an apocalyptic number.

It is an amenable number.

65043813 is a deficient number, since it is larger than the sum of its proper divisors (21681275).

65043813 is a wasteful number, since it uses less digits than its factorization.

65043813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21681274.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 65043813 is about 8064.9744574921. The cubic root of 65043813 is about 402.1628940602.

Adding to 65043813 its reverse (31834056), we get a palindrome (96877869).

It can be divided in two parts, 65043 and 813, that added together give a palindrome (65856).

The spelling of 65043813 in words is "sixty-five million, forty-three thousand, eight hundred thirteen".