65831993 has 4 divisors (see below), whose sum is σ = 66911268. Its totient is φ = 64752720.

The previous prime is 65831977. The next prime is 65831999. The reversal of 65831993 is 39913856.

65831993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 34951744 + 30880249 = 5912^2 + 5557^2 .

It is not a de Polignac number, because 65831993 - 2⁴ = 65831977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65831999) by changing a digit.

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, 539546 + ... + 539667.

It is an arithmetic number, because the mean of its divisors is an integer number (16727817).

Almost surely, 2^65831993 is an apocalyptic number.

It is an amenable number.

65831993 is a deficient number, since it is larger than the sum of its proper divisors (1079275).

65831993 is a wasteful number, since it uses less digits than its factorization.

65831993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079274.

The product of its digits is 174960, while the sum is 44.

The square root of 65831993 is about 8113.6916998368. The cubic root of 65831993 is about 403.7808033063.

The spelling of 65831993 in words is "sixty-five million, eight hundred thirty-one thousand, nine hundred ninety-three".