82577561 has 4 divisors (see below), whose sum is σ = 90084624. Its totient is φ = 75070500.

The previous prime is 82577557. The next prime is 82577603. The reversal of 82577561 is 16577528.

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 82577561 - 2² = 82577557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82577531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3753515 + ... + 3753536.

It is an arithmetic number, because the mean of its divisors is an integer number (22521156).

Almost surely, 2^82577561 is an apocalyptic number.

It is an amenable number.

82577561 is a deficient number, since it is larger than the sum of its proper divisors (7507063).

82577561 is a wasteful number, since it uses less digits than its factorization.

82577561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7507062.

The product of its digits is 117600, while the sum is 41.

The square root of 82577561 is about 9087.2196517967. The cubic root of 82577561 is about 435.4657643843.

It can be divided in two parts, 82577 and 561, that added together give a palindrome (83138).

The spelling of 82577561 in words is "eighty-two million, five hundred seventy-seven thousand, five hundred sixty-one".