83430521 has 4 divisors (see below), whose sum is σ = 84435792. Its totient is φ = 82425252.

The previous prime is 83430481. The next prime is 83430527. The reversal of 83430521 is 12503438.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83430521 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83430527) 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, 502511 + ... + 502676.

It is an arithmetic number, because the mean of its divisors is an integer number (21108948).

Almost surely, 2^83430521 is an apocalyptic number.

It is an amenable number.

83430521 is a deficient number, since it is larger than the sum of its proper divisors (1005271).

83430521 is a wasteful number, since it uses less digits than its factorization.

83430521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005270.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 83430521 is about 9134.0309283470. The cubic root of 83430521 is about 436.9599688941.

Adding to 83430521 its reverse (12503438), we get a palindrome (95933959).

The spelling of 83430521 in words is "eighty-three million, four hundred thirty thousand, five hundred twenty-one".