82521679 has 4 divisors (see below), whose sum is σ = 83171584. Its totient is φ = 81871776.

The previous prime is 82521661. The next prime is 82521697. The reversal of 82521679 is 97612528.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (82521661) and next prime (82521697).

It is a cyclic number.

It is not a de Polignac number, because 82521679 - 2²¹ = 80424527 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 (82521379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324762 + ... + 325015.

It is an arithmetic number, because the mean of its divisors is an integer number (20792896).

Almost surely, 2^82521679 is an apocalyptic number.

82521679 is a deficient number, since it is larger than the sum of its proper divisors (649905).

82521679 is a wasteful number, since it uses less digits than its factorization.

82521679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649904.

The product of its digits is 60480, while the sum is 40.

The square root of 82521679 is about 9084.1443735775. The cubic root of 82521679 is about 435.3675125554.

The spelling of 82521679 in words is "eighty-two million, five hundred twenty-one thousand, six hundred seventy-nine".