82191861 has 32 divisors (see below), whose sum is σ = 125337600. Its totient is φ = 53207280.

The previous prime is 82191859. The next prime is 82191869. The reversal of 82191861 is 16819128.

It is not a de Polignac number, because 82191861 - 2¹ = 82191859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82191869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303156 + ... + 303426.

It is an arithmetic number, because the mean of its divisors is an integer number (3916800).

Almost surely, 2^82191861 is an apocalyptic number.

It is an amenable number.

82191861 is a deficient number, since it is larger than the sum of its proper divisors (43145739).

82191861 is a wasteful number, since it uses less digits than its factorization.

82191861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566 (or 560 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 82191861 is about 9065.9727001574. The cubic root of 82191861 is about 434.7867206549.

The spelling of 82191861 in words is "eighty-two million, one hundred ninety-one thousand, eight hundred sixty-one".