82031521 has 8 divisors (see below), whose sum is σ = 96372864. Its totient is φ = 68837520.

The previous prime is 82031507. The next prime is 82031527. The reversal of 82031521 is 12513028.

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 82031521 - 2⁷ = 82031393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82031492 and 82031501.

It is not an unprimeable number, because it can be changed into a prime (82031527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286681 + ... + 286966.

It is an arithmetic number, because the mean of its divisors is an integer number (12046608).

Almost surely, 2^82031521 is an apocalyptic number.

It is an amenable number.

82031521 is a deficient number, since it is larger than the sum of its proper divisors (14341343).

82031521 is a wasteful number, since it uses less digits than its factorization.

82031521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573671.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 82031521 is about 9057.1254269774. The cubic root of 82031521 is about 434.5038090881.

Adding to 82031521 its reverse (12513028), we get a palindrome (94544549).

The spelling of 82031521 in words is "eighty-two million, thirty-one thousand, five hundred twenty-one".