83307521 has 8 divisors (see below), whose sum is σ = 91065600. Its totient is φ = 75580240.

The previous prime is 83307493. The next prime is 83307529. The reversal of 83307521 is 12570338.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 83307521 - 2¹⁴ = 83291137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83307529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1841 + ... + 13038.

It is an arithmetic number, because the mean of its divisors is an integer number (11383200).

Almost surely, 2^83307521 is an apocalyptic number.

It is an amenable number.

83307521 is a deficient number, since it is larger than the sum of its proper divisors (7758079).

83307521 is a wasteful number, since it uses less digits than its factorization.

83307521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15399.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 83307521 is about 9127.2953825325. The cubic root of 83307521 is about 436.7451294107.

Adding to 83307521 its reverse (12570338), we get a palindrome (95877859).

It can be divided in two parts, 8330 and 7521, that added together give a palindrome (15851).

The spelling of 83307521 in words is "eighty-three million, three hundred seven thousand, five hundred twenty-one".