83920875481 has 9 divisors (see below), whose sum is σ = 85930665951. Its totient is φ = 81957060192.

The previous prime is 83920875449. The next prime is 83920875503. The reversal of 83920875481 is 18457802938.

The square root of 83920875481 is 289691.

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

It can be written as a sum of positive squares in only one way, i.e., 42867632025 + 41053243456 = 207045^2 + 202616^2 .

It is not a de Polignac number, because 83920875481 - 2⁵ = 83920875449 is a prime.

It is a super-2 number, since 2×83920875481² (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 (83920875281) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12453345 + ... + 12460081.

Almost surely, 2^83920875481 is an apocalyptic number.

83920875481 is the 289691-st square number.

83920875481 is the 144846-th centered octagonal number.

It is an amenable number.

83920875481 is a deficient number, since it is larger than the sum of its proper divisors (2009790470).

83920875481 is an frugal number, since it uses more digits than its factorization.

83920875481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13560 (or 6780 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 83920875481 in words is "eighty-three billion, nine hundred twenty million, eight hundred seventy-five thousand, four hundred eighty-one".