82511515 has 4 divisors (see below), whose sum is σ = 99013824. Its totient is φ = 66009208.

The previous prime is 82511503. The next prime is 82511521. The reversal of 82511515 is 51511528.

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

It is a cyclic number.

It is not a de Polignac number, because 82511515 - 2¹¹ = 82509467 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8251147 + ... + 8251156.

It is an arithmetic number, because the mean of its divisors is an integer number (24753456).

Almost surely, 2^82511515 is an apocalyptic number.

82511515 is a deficient number, since it is larger than the sum of its proper divisors (16502309).

82511515 is a wasteful number, since it uses less digits than its factorization.

82511515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16502308.

The product of its digits is 2000, while the sum is 28.

The square root of 82511515 is about 9083.5849200632. The cubic root of 82511515 is about 435.3496374260.

The spelling of 82511515 in words is "eighty-two million, five hundred eleven thousand, five hundred fifteen".