82191019 has 8 divisors (see below), whose sum is σ = 84378672. Its totient is φ = 80012160.

The previous prime is 82191007. The next prime is 82191037. The reversal of 82191019 is 91019128.

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 82191019 - 2¹¹ = 82188971 is a prime.

It is a super-2 number, since 2×82191019² = 13510727208516722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82191049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19527 + ... + 23359.

It is an arithmetic number, because the mean of its divisors is an integer number (10547334).

Almost surely, 2^82191019 is an apocalyptic number.

82191019 is a deficient number, since it is larger than the sum of its proper divisors (2187653).

82191019 is a wasteful number, since it uses less digits than its factorization.

82191019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4397.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 82191019 is about 9065.9262626606. The cubic root of 82191019 is about 434.7852359512.

The spelling of 82191019 in words is "eighty-two million, one hundred ninety-one thousand, nineteen".