82719121 has 4 divisors (see below), whose sum is σ = 84121200. Its totient is φ = 81317044.

The previous prime is 82719113. The next prime is 82719137. The reversal of 82719121 is 12191728.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82719121 - 2³ = 82719113 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82719421) 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 3 ways as a sum of consecutive naturals, for example, 700951 + ... + 701068.

It is an arithmetic number, because the mean of its divisors is an integer number (21030300).

Almost surely, 2^82719121 is an apocalyptic number.

It is an amenable number.

82719121 is a deficient number, since it is larger than the sum of its proper divisors (1402079).

82719121 is a wasteful number, since it uses less digits than its factorization.

82719121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402078.

The product of its digits is 2016, while the sum is 31.

The square root of 82719121 is about 9095.0052776235. The cubic root of 82719121 is about 435.7144572145.

The spelling of 82719121 in words is "eighty-two million, seven hundred nineteen thousand, one hundred twenty-one".