82819391 has 8 divisors (see below), whose sum is σ = 84039120. Its totient is φ = 81608128.

The previous prime is 82819339. The next prime is 82819403. The reversal of 82819391 is 19391828.

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 82819391 - 2²² = 78625087 is a prime.

It is a super-2 number, since 2×82819391² = 13718103051221762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82819691) 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 7 ways as a sum of consecutive naturals, for example, 19115 + ... + 23043.

It is an arithmetic number, because the mean of its divisors is an integer number (10504890).

Almost surely, 2^82819391 is an apocalyptic number.

82819391 is a deficient number, since it is larger than the sum of its proper divisors (1219729).

82819391 is a wasteful number, since it uses less digits than its factorization.

82819391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4233.

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

The square root of 82819391 is about 9100.5159743830. The cubic root of 82819391 is about 435.8904400950.

The spelling of 82819391 in words is "eighty-two million, eight hundred nineteen thousand, three hundred ninety-one".