82655821 has 4 divisors (see below), whose sum is σ = 82676700. Its totient is φ = 82634944.

The previous prime is 82655809. The next prime is 82655831. The reversal of 82655821 is 12855628.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10150596 + 72505225 = 3186^2 + 8515^2 .

It is a cyclic number.

It is not a de Polignac number, because 82655821 - 2⁵ = 82655789 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 (82655831) 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, 2476 + ... + 13093.

It is an arithmetic number, because the mean of its divisors is an integer number (20669175).

Almost surely, 2^82655821 is an apocalyptic number.

It is an amenable number.

82655821 is a deficient number, since it is larger than the sum of its proper divisors (20879).

82655821 is a wasteful number, since it uses less digits than its factorization.

82655821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20878.

The product of its digits is 38400, while the sum is 37.

The square root of 82655821 is about 9091.5246796123. The cubic root of 82655821 is about 435.6032867737.

The spelling of 82655821 in words is "eighty-two million, six hundred fifty-five thousand, eight hundred twenty-one".