82809931 has 8 divisors (see below), whose sum is σ = 83528640. Its totient is φ = 82094592.

The previous prime is 82809929. The next prime is 82809943. The reversal of 82809931 is 13990828.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82809931 - 2¹ = 82809929 is a prime.

It is a super-2 number, since 2×82809931² = 13714969344449522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82809901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74526 + ... + 75628.

It is an arithmetic number, because the mean of its divisors is an integer number (10441080).

Almost surely, 2^82809931 is an apocalyptic number.

82809931 is a deficient number, since it is larger than the sum of its proper divisors (718709).

82809931 is a wasteful number, since it uses less digits than its factorization.

82809931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 82809931 is about 9099.9962087904. The cubic root of 82809931 is about 435.8738430134.

The spelling of 82809931 in words is "eighty-two million, eight hundred nine thousand, nine hundred thirty-one".