82205551 has 4 divisors (see below), whose sum is σ = 84117352. Its totient is φ = 80293752.

The previous prime is 82205549. The next prime is 82205561. The reversal of 82205551 is 15550228.

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 82205551 - 2¹ = 82205549 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 (82205531) 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, 955836 + ... + 955921.

It is an arithmetic number, because the mean of its divisors is an integer number (21029338).

Almost surely, 2^82205551 is an apocalyptic number.

82205551 is a deficient number, since it is larger than the sum of its proper divisors (1911801).

82205551 is a wasteful number, since it uses less digits than its factorization.

82205551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911800.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 82205551 is about 9066.7276897456. The cubic root of 82205551 is about 434.8108588915.

Adding to 82205551 its reverse (15550228), we get a palindrome (97755779).

The spelling of 82205551 in words is "eighty-two million, two hundred five thousand, five hundred fifty-one".