82821871 has 4 divisors (see below), whose sum is σ = 90351144. Its totient is φ = 75292600.

The previous prime is 82821859. The next prime is 82821889. The reversal of 82821871 is 17812828.

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

It is a cyclic number.

It is not a de Polignac number, because 82821871 - 2⁹ = 82821359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82821871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82821371) 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, 3764620 + ... + 3764641.

It is an arithmetic number, because the mean of its divisors is an integer number (22587786).

Almost surely, 2^82821871 is an apocalyptic number.

82821871 is a deficient number, since it is larger than the sum of its proper divisors (7529273).

82821871 is a wasteful number, since it uses less digits than its factorization.

82821871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7529272.

The product of its digits is 14336, while the sum is 37.

The square root of 82821871 is about 9100.6522293735. The cubic root of 82821871 is about 435.8947909179.

It can be divided in two parts, 8282 and 1871, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 82821871 in words is "eighty-two million, eight hundred twenty-one thousand, eight hundred seventy-one".