83991316 has 6 divisors (see below), whose sum is σ = 146984810. Its totient is φ = 41995656.

The previous prime is 83991289. The next prime is 83991317. The reversal of 83991316 is 61319938.

It can be written as a sum of positive squares in only one way, i.e., 81974916 + 2016400 = 9054^2 + 1420^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83991317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10498911 + ... + 10498918.

Almost surely, 2^83991316 is an apocalyptic number.

It is an amenable number.

83991316 is a deficient number, since it is larger than the sum of its proper divisors (62993494).

83991316 is a wasteful number, since it uses less digits than its factorization.

83991316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20997833 (or 20997831 counting only the distinct ones).

The product of its digits is 34992, while the sum is 40.

The square root of 83991316 is about 9164.6776266271. The cubic root of 83991316 is about 437.9368215067.

The spelling of 83991316 in words is "eighty-three million, nine hundred ninety-one thousand, three hundred sixteen".