83529821 has 4 divisors (see below), whose sum is σ = 83962812. Its totient is φ = 83096832.

The previous prime is 83529737. The next prime is 83529827. The reversal of 83529821 is 12892538.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12892538 = 2 ⋅6446269.

It can be written as a sum of positive squares in 2 ways, for example, as 24393721 + 59136100 = 4939^2 + 7690^2 .

It is a cyclic number.

It is not a de Polignac number, because 83529821 - 2²² = 79335517 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 (83529827) 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, 216206 + ... + 216591.

It is an arithmetic number, because the mean of its divisors is an integer number (20990703).

Almost surely, 2^83529821 is an apocalyptic number.

It is an amenable number.

83529821 is a deficient number, since it is larger than the sum of its proper divisors (432991).

83529821 is a wasteful number, since it uses less digits than its factorization.

83529821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432990.

The product of its digits is 34560, while the sum is 38.

The square root of 83529821 is about 9139.4650281075. The cubic root of 83529821 is about 437.1332584820.

The spelling of 83529821 in words is "eighty-three million, five hundred twenty-nine thousand, eight hundred twenty-one".