82851515 has 4 divisors (see below), whose sum is σ = 99421824. Its totient is φ = 66281208.

The previous prime is 82851511. The next prime is 82851541. The reversal of 82851515 is 51515828.

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 82851515 - 2² = 82851511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82851511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8285147 + ... + 8285156.

It is an arithmetic number, because the mean of its divisors is an integer number (24855456).

Almost surely, 2^82851515 is an apocalyptic number.

82851515 is a deficient number, since it is larger than the sum of its proper divisors (16570309).

82851515 is a wasteful number, since it uses less digits than its factorization.

82851515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16570308.

The product of its digits is 16000, while the sum is 35.

The square root of 82851515 is about 9102.2807581397. The cubic root of 82851515 is about 435.9467905635.

The spelling of 82851515 in words is "eighty-two million, eight hundred fifty-one thousand, five hundred fifteen".