82109511 has 48 divisors (see below), whose sum is σ = 137192160. Its totient is φ = 48470400.

The previous prime is 82109459. The next prime is 82109513. The reversal of 82109511 is 11590128.

It is not a de Polignac number, because 82109511 - 2¹¹ = 82107463 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82109513) 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 47 ways as a sum of consecutive naturals, for example, 133641 + ... + 134253.

It is an arithmetic number, because the mean of its divisors is an integer number (2858170).

Almost surely, 2^82109511 is an apocalyptic number.

82109511 is a deficient number, since it is larger than the sum of its proper divisors (55082649).

82109511 is a wasteful number, since it uses less digits than its factorization.

82109511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 82109511 is about 9061.4298540573. The cubic root of 82109511 is about 434.6414643788.

Adding to 82109511 its reverse (11590128), we get a palindrome (93699639).

The spelling of 82109511 in words is "eighty-two million, one hundred nine thousand, five hundred eleven".