83563821 has 24 divisors (see below), whose sum is σ = 132035904. Its totient is φ = 50506560.

The previous prime is 83563811. The next prime is 83563829. The reversal of 83563821 is 12836538.

It is not a de Polignac number, because 83563821 - 2⁹ = 83563309 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83563829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44320 + ... + 46166.

It is an arithmetic number, because the mean of its divisors is an integer number (5501496).

Almost surely, 2^83563821 is an apocalyptic number.

It is an amenable number.

83563821 is a deficient number, since it is larger than the sum of its proper divisors (48472083).

83563821 is a wasteful number, since it uses less digits than its factorization.

83563821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2321 (or 2318 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 83563821 is about 9141.3249039732. The cubic root of 83563821 is about 437.1925607149.

The spelling of 83563821 in words is "eighty-three million, five hundred sixty-three thousand, eight hundred twenty-one".