83309813 has 4 divisors (see below), whose sum is σ = 87694560. Its totient is φ = 78925068.

The previous prime is 83309797. The next prime is 83309857. The reversal of 83309813 is 31890338.

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 a cyclic number.

It is not a de Polignac number, because 83309813 - 2⁴ = 83309797 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 (83309873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2192345 + ... + 2192382.

It is an arithmetic number, because the mean of its divisors is an integer number (21923640).

Almost surely, 2^83309813 is an apocalyptic number.

It is an amenable number.

83309813 is a deficient number, since it is larger than the sum of its proper divisors (4384747).

83309813 is a wasteful number, since it uses less digits than its factorization.

83309813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4384746.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 83309813 is about 9127.4209391262. The cubic root of 83309813 is about 436.7491346939.

The spelling of 83309813 in words is "eighty-three million, three hundred nine thousand, eight hundred thirteen".