83912369521 has 4 divisors (see below), whose sum is σ = 83927629044. Its totient is φ = 83897110000.

The previous prime is 83912369501. The next prime is 83912369531. The reversal of 83912369521 is 12596321938.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46931156496 + 36981213025 = 216636^2 + 192305^2 .

It is a cyclic number.

It is not a de Polignac number, because 83912369521 - 2²⁵ = 83878815089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83912369501) 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, 7621510 + ... + 7632511.

It is an arithmetic number, because the mean of its divisors is an integer number (20981907261).

Almost surely, 2^83912369521 is an apocalyptic number.

It is an amenable number.

83912369521 is a deficient number, since it is larger than the sum of its proper divisors (15259523).

83912369521 is a wasteful number, since it uses less digits than its factorization.

83912369521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15259522.

The product of its digits is 699840, while the sum is 49.

The spelling of 83912369521 in words is "eighty-three billion, nine hundred twelve million, three hundred sixty-nine thousand, five hundred twenty-one".