83602517881 has 3 divisors (see below), whose sum is σ = 83602807023. Its totient is φ = 83602228740.

The previous prime is 83602517851. The next prime is 83602517891. The reversal of 83602517881 is 18871520638.

The square root of 83602517881 is 289141.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 80263989481 + 3338528400 = 283309^2 + 57780^2 .

It is not a de Polignac number, because 83602517881 - 2⁷ = 83602517753 is a prime.

It is a super-2 number, since 2×83602517881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83602517851) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 144571 + ... + 433711.

It is an arithmetic number, because the mean of its divisors is an integer number (27867602341).

Almost surely, 2^83602517881 is an apocalyptic number.

83602517881 is the 289141-st square number.

83602517881 is the 144571-st centered octagonal number.

It is an amenable number.

83602517881 is a deficient number, since it is larger than the sum of its proper divisors (289142).

83602517881 is an frugal number, since it uses more digits than its factorization.

83602517881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578282 (or 289141 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 49.

Multiplying 83602517881 by its sum of digits (49), we get a square (4096523376169 = 2023987²).

The spelling of 83602517881 in words is "eighty-three billion, six hundred two million, five hundred seventeen thousand, eight hundred eighty-one".