82133391 has 16 divisors (see below), whose sum is σ = 114667776. Its totient is φ = 52193856.

The previous prime is 82133351. The next prime is 82133399. The reversal of 82133391 is 19333128.

It is not a de Polignac number, because 82133391 - 2⁶ = 82133327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82133399) 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 15 ways as a sum of consecutive naturals, for example, 19696 + ... + 23498.

It is an arithmetic number, because the mean of its divisors is an integer number (7166736).

Almost surely, 2^82133391 is an apocalyptic number.

82133391 is a deficient number, since it is larger than the sum of its proper divisors (32534385).

82133391 is a wasteful number, since it uses less digits than its factorization.

82133391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4142.

The product of its digits is 3888, while the sum is 30.

The square root of 82133391 is about 9062.7474311050. The cubic root of 82133391 is about 434.6835960474.

The spelling of 82133391 in words is "eighty-two million, one hundred thirty-three thousand, three hundred ninety-one".