81986035319 has 4 divisors (see below), whose sum is σ = 82079096400. Its totient is φ = 81892974240.

The previous prime is 81986035289. The next prime is 81986035333. The reversal of 81986035319 is 91353068918.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91353068918 = 2 ⋅45676534459.

It is a cyclic number.

It is not a de Polignac number, because 81986035319 - 2¹⁶ = 81985969783 is a prime.

It is a super-2 number, since 2×81986035319² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81986035399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46529219 + ... + 46530980.

It is an arithmetic number, because the mean of its divisors is an integer number (20519774100).

Almost surely, 2^81986035319 is an apocalyptic number.

81986035319 is a deficient number, since it is larger than the sum of its proper divisors (93061081).

81986035319 is an equidigital number, since it uses as much as digits as its factorization.

81986035319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93061080.

The product of its (nonzero) digits is 1399680, while the sum is 53.

The spelling of 81986035319 in words is "eighty-one billion, nine hundred eighty-six million, thirty-five thousand, three hundred nineteen".