82102511 has 4 divisors (see below), whose sum is σ = 82123800. Its totient is φ = 82081224.

The previous prime is 82102507. The next prime is 82102529. The reversal of 82102511 is 11520128.

It is a happy number.

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 82102511 - 2² = 82102507 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 (82108511) 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, 3056 + ... + 13173.

It is an arithmetic number, because the mean of its divisors is an integer number (20530950).

Almost surely, 2^82102511 is an apocalyptic number.

82102511 is a deficient number, since it is larger than the sum of its proper divisors (21289).

82102511 is a wasteful number, since it uses less digits than its factorization.

82102511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21288.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 82102511 is about 9061.0435933175. The cubic root of 82102511 is about 434.6291126764.

Adding to 82102511 its reverse (11520128), we get a palindrome (93622639).

The spelling of 82102511 in words is "eighty-two million, one hundred two thousand, five hundred eleven".