81237192283 has 4 divisors (see below), whose sum is σ = 87486207088. Its totient is φ = 74988177480.

The previous prime is 81237192271. The next prime is 81237192293. The reversal of 81237192283 is 38229173218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81237192283 - 2³³ = 72647257691 is a prime.

It is a super-2 number, since 2×81237192283² (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 (81237192293) 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, 3124507383 + ... + 3124507408.

It is an arithmetic number, because the mean of its divisors is an integer number (21871551772).

Almost surely, 2^81237192283 is an apocalyptic number.

81237192283 is a deficient number, since it is larger than the sum of its proper divisors (6249014805).

81237192283 is a wasteful number, since it uses less digits than its factorization.

81237192283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6249014804.

The product of its digits is 290304, while the sum is 46.

The spelling of 81237192283 in words is "eighty-one billion, two hundred thirty-seven million, one hundred ninety-two thousand, two hundred eighty-three".