82517261 has 4 divisors (see below), whose sum is σ = 86104992. Its totient is φ = 78929532.

The previous prime is 82517219. The next prime is 82517273. The reversal of 82517261 is 16271528.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82517261 - 2¹⁰ = 82516237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82517761) 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, 1793831 + ... + 1793876.

It is an arithmetic number, because the mean of its divisors is an integer number (21526248).

Almost surely, 2^82517261 is an apocalyptic number.

It is an amenable number.

82517261 is a deficient number, since it is larger than the sum of its proper divisors (3587731).

82517261 is a wasteful number, since it uses less digits than its factorization.

82517261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3587730.

The product of its digits is 6720, while the sum is 32.

The square root of 82517261 is about 9083.9011993746. The cubic root of 82517261 is about 435.3597429284.

Adding to 82517261 its reverse (16271528), we get a palindrome (98788789).

The spelling of 82517261 in words is "eighty-two million, five hundred seventeen thousand, two hundred sixty-one".