82521971 has 12 divisors (see below), whose sum is σ = 96680976. Its totient is φ = 68998080.

The previous prime is 82521947. The next prime is 82521973. The reversal of 82521971 is 17912528.

It is a de Polignac number, because none of the positive numbers 2^k-82521971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82521973) 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, 8261 + ... + 15273.

It is an arithmetic number, because the mean of its divisors is an integer number (8056748).

Almost surely, 2^82521971 is an apocalyptic number.

82521971 is a deficient number, since it is larger than the sum of its proper divisors (14159005).

82521971 is an equidigital number, since it uses as much as digits as its factorization.

82521971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7102 (or 7061 counting only the distinct ones).

The product of its digits is 10080, while the sum is 35.

The square root of 82521971 is about 9084.1604455227. The cubic root of 82521971 is about 435.3680260656.

The spelling of 82521971 in words is "eighty-two million, five hundred twenty-one thousand, nine hundred seventy-one".