83231871517 has 18 divisors (see below), whose sum is σ = 87594966942. Its totient is φ = 79027338096.

The previous prime is 83231871493. The next prime is 83231871559. The reversal of 83231871517 is 71517813238.

It can be written as a sum of positive squares in only one way, i.e., 80982361476 + 2249510041 = 284574^2 + 47429^2 .

It is not a de Polignac number, because 83231871517 - 2⁷ = 83231871389 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 (83231871017) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 75458988 + ... + 75460090.

Almost surely, 2^83231871517 is an apocalyptic number.

It is an amenable number.

83231871517 is a deficient number, since it is larger than the sum of its proper divisors (4363095425).

83231871517 is an frugal number, since it uses more digits than its factorization.

83231871517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329 (or 1183 counting only the distinct ones).

The product of its digits is 282240, while the sum is 46.

The spelling of 83231871517 in words is "eighty-three billion, two hundred thirty-one million, eight hundred seventy-one thousand, five hundred seventeen".