82821551 has 8 divisors (see below), whose sum is σ = 90971520. Its totient is φ = 75050712.

The previous prime is 82821533. The next prime is 82821559. The reversal of 82821551 is 15512828.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82821551 - 2¹⁴ = 82805167 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 (82821559) 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 7 ways as a sum of consecutive naturals, for example, 94325 + ... + 95198.

It is an arithmetic number, because the mean of its divisors is an integer number (11371440).

Almost surely, 2^82821551 is an apocalyptic number.

82821551 is a deficient number, since it is larger than the sum of its proper divisors (8149969).

82821551 is a wasteful number, since it uses less digits than its factorization.

82821551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189565.

The product of its digits is 6400, while the sum is 32.

The square root of 82821551 is about 9100.6346481990. The cubic root of 82821551 is about 435.8942295263.

The spelling of 82821551 in words is "eighty-two million, eight hundred twenty-one thousand, five hundred fifty-one".