83871997 has 6 divisors (see below), whose sum is σ = 92190014. Its totient is φ = 76247160.

The previous prime is 83871979. The next prime is 83872013. The reversal of 83871997 is 79917838.

It can be written as a sum of positive squares in only one way, i.e., 77246521 + 6625476 = 8789^2 + 2574^2 .

It is not a de Polignac number, because 83871997 - 2¹⁹ = 83347709 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 (83871397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 346458 + ... + 346699.

Almost surely, 2^83871997 is an apocalyptic number.

It is an amenable number.

83871997 is a deficient number, since it is larger than the sum of its proper divisors (8318017).

83871997 is a wasteful number, since it uses less digits than its factorization.

83871997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693179 (or 693168 counting only the distinct ones).

The product of its digits is 762048, while the sum is 52.

The square root of 83871997 is about 9158.1655914271. The cubic root of 83871997 is about 437.7293439168.

The spelling of 83871997 in words is "eighty-three million, eight hundred seventy-one thousand, nine hundred ninety-seven".