82819931 has 4 divisors (see below), whose sum is σ = 83624112. Its totient is φ = 82015752.

The previous prime is 82819927. The next prime is 82819939. The reversal of 82819931 is 13991828.

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 82819931 - 2² = 82819927 is a prime.

It is a super-2 number, since 2×82819931² = 13718281941689522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82819939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401936 + ... + 402141.

It is an arithmetic number, because the mean of its divisors is an integer number (20906028).

Almost surely, 2^82819931 is an apocalyptic number.

82819931 is a deficient number, since it is larger than the sum of its proper divisors (804181).

82819931 is a wasteful number, since it uses less digits than its factorization.

82819931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804180.

The product of its digits is 31104, while the sum is 41.

The square root of 82819931 is about 9100.5456429821. The cubic root of 82819931 is about 435.8913874590.

The spelling of 82819931 in words is "eighty-two million, eight hundred nineteen thousand, nine hundred thirty-one".