82561523 has 4 divisors (see below), whose sum is σ = 90067128. Its totient is φ = 75055920.

The previous prime is 82561519. The next prime is 82561547. The reversal of 82561523 is 32516528.

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 82561523 - 2² = 82561519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82561523.

It is not an unprimeable number, because it can be changed into a prime (82561553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3752786 + ... + 3752807.

It is an arithmetic number, because the mean of its divisors is an integer number (22516782).

Almost surely, 2^82561523 is an apocalyptic number.

82561523 is a deficient number, since it is larger than the sum of its proper divisors (7505605).

82561523 is a wasteful number, since it uses less digits than its factorization.

82561523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7505604.

The product of its digits is 14400, while the sum is 32.

The square root of 82561523 is about 9086.3371608146. The cubic root of 82561523 is about 435.4375708814.

It can be divided in two parts, 8256 and 1523, that added together give a palindrome (9779).

The spelling of 82561523 in words is "eighty-two million, five hundred sixty-one thousand, five hundred twenty-three".