83820871 has 2 divisors, whose sum is σ = 83820872. Its totient is φ = 83820870.

The previous prime is 83820839. The next prime is 83820907. The reversal of 83820871 is 17802838.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83820871 - 2⁵ = 83820839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83820871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83820811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41910435 + 41910436.

It is an arithmetic number, because the mean of its divisors is an integer number (41910436).

Almost surely, 2^83820871 is an apocalyptic number.

83820871 is a deficient number, since it is larger than the sum of its proper divisors (1).

83820871 is an equidigital number, since it uses as much as digits as its factorization.

83820871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 83820871 is about 9155.3738864123. The cubic root of 83820871 is about 437.6403833577.

The spelling of 83820871 in words is "eighty-three million, eight hundred twenty thousand, eight hundred seventy-one".