82521831 has 12 divisors (see below), whose sum is σ = 127993272. Its totient is φ = 47155248.

The previous prime is 82521811. The next prime is 82521833. The reversal of 82521831 is 13812528.

It is not a de Polignac number, because 82521831 - 2⁹ = 82521319 is a prime.

It is a super-2 number, since 2×82521831² = 13619705183185122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82521833) 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 11 ways as a sum of consecutive naturals, for example, 280540 + ... + 280833.

It is an arithmetic number, because the mean of its divisors is an integer number (10666106).

Almost surely, 2^82521831 is an apocalyptic number.

82521831 is a deficient number, since it is larger than the sum of its proper divisors (45471441).

82521831 is a wasteful number, since it uses less digits than its factorization.

82521831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561390 (or 561383 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 82521831 is about 9084.1527397991. The cubic root of 82521831 is about 435.3677798623.

The spelling of 82521831 in words is "eighty-two million, five hundred twenty-one thousand, eight hundred thirty-one".