84828251521 has 4 divisors (see below), whose sum is σ = 91353501652. Its totient is φ = 78303001392.

The previous prime is 84828251507. The next prime is 84828251551. The reversal of 84828251521 is 12515282848.

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 50608801296 + 34219450225 = 224964^2 + 184985^2 .

It is a cyclic number.

It is not a de Polignac number, because 84828251521 - 2⁵ = 84828251489 is a prime.

It is a super-2 number, since 2×84828251521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84828251551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3262625046 + ... + 3262625071.

It is an arithmetic number, because the mean of its divisors is an integer number (22838375413).

Almost surely, 2^84828251521 is an apocalyptic number.

It is an amenable number.

84828251521 is a deficient number, since it is larger than the sum of its proper divisors (6525250131).

84828251521 is a wasteful number, since it uses less digits than its factorization.

84828251521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6525250130.

The product of its digits is 409600, while the sum is 46.

The spelling of 84828251521 in words is "eighty-four billion, eight hundred twenty-eight million, two hundred fifty-one thousand, five hundred twenty-one".