82911509 has 4 divisors (see below), whose sum is σ = 83176716. Its totient is φ = 82646304.

The previous prime is 82911503. The next prime is 82911571. The reversal of 82911509 is 90511928.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6838225 + 76073284 = 2615^2 + 8722^2 .

It is a cyclic number.

It is not a de Polignac number, because 82911509 - 2¹² = 82907413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82911503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132134 + ... + 132759.

It is an arithmetic number, because the mean of its divisors is an integer number (20794179).

Almost surely, 2^82911509 is an apocalyptic number.

It is an amenable number.

82911509 is a deficient number, since it is larger than the sum of its proper divisors (265207).

82911509 is a wasteful number, since it uses less digits than its factorization.

82911509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265206.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 82911509 is about 9105.5757094211. The cubic root of 82911509 is about 436.0519903353.

The spelling of 82911509 in words is "eighty-two million, nine hundred eleven thousand, five hundred nine".