82809751 has 4 divisors (see below), whose sum is σ = 82832904. Its totient is φ = 82786600.

The previous prime is 82809743. The next prime is 82809763. The reversal of 82809751 is 15790828.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 82809751 - 2³ = 82809743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82809721) 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, 4945 + ... + 13786.

It is an arithmetic number, because the mean of its divisors is an integer number (20708226).

Almost surely, 2^82809751 is an apocalyptic number.

82809751 is a deficient number, since it is larger than the sum of its proper divisors (23153).

82809751 is a wasteful number, since it uses less digits than its factorization.

82809751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23152.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 82809751 is about 9099.9863186710. The cubic root of 82809751 is about 435.8735272004.

The spelling of 82809751 in words is "eighty-two million, eight hundred nine thousand, seven hundred fifty-one".