83504521 has 4 divisors (see below), whose sum is σ = 85080132. Its totient is φ = 81928912.

The previous prime is 83504507. The next prime is 83504537. The reversal of 83504521 is 12540538.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12540538 = 2 ⋅6270269.

It can be written as a sum of positive squares in 2 ways, for example, as 61779600 + 21724921 = 7860^2 + 4661^2 .

It is a cyclic number.

It is not a de Polignac number, because 83504521 - 2⁹ = 83504009 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 83504521.

It is not an unprimeable number, because it can be changed into a prime (83504321) 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, 787726 + ... + 787831.

It is an arithmetic number, because the mean of its divisors is an integer number (21270033).

Almost surely, 2^83504521 is an apocalyptic number.

It is an amenable number.

83504521 is a deficient number, since it is larger than the sum of its proper divisors (1575611).

83504521 is a wasteful number, since it uses less digits than its factorization.

83504521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575610.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 83504521 is about 9138.0808160138. The cubic root of 83504521 is about 437.0891202006.

The spelling of 83504521 in words is "eighty-three million, five hundred four thousand, five hundred twenty-one".