82180801 has 4 divisors (see below), whose sum is σ = 82732500. Its totient is φ = 81629104.

The previous prime is 82180799. The next prime is 82180823. The reversal of 82180801 is 10808128.

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 5180176 + 77000625 = 2276^2 + 8775^2 .

It is a cyclic number.

It is not a de Polignac number, because 82180801 - 2¹ = 82180799 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 82180801.

It is not an unprimeable number, because it can be changed into a prime (82180841) 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, 275626 + ... + 275923.

It is an arithmetic number, because the mean of its divisors is an integer number (20683125).

Almost surely, 2^82180801 is an apocalyptic number.

It is an amenable number.

82180801 is a deficient number, since it is larger than the sum of its proper divisors (551699).

82180801 is a wasteful number, since it uses less digits than its factorization.

82180801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551698.

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 82180801 is about 9065.3627064779. The cubic root of 82180801 is about 434.7672176823.

Adding to 82180801 its reverse (10808128), we get a palindrome (92988929).

The spelling of 82180801 in words is "eighty-two million, one hundred eighty thousand, eight hundred one".