81112131 has 8 divisors (see below), whose sum is σ = 120166160. Its totient is φ = 54074736.

The previous prime is 81112111. The next prime is 81112133. The reversal of 81112131 is 13121118.

It is a happy number.

It is not a de Polignac number, because 81112131 - 2⁹ = 81111619 is a prime.

It is a super-2 number, since 2×81112131² = 13158355590722322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81112133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1502050 + ... + 1502103.

It is an arithmetic number, because the mean of its divisors is an integer number (15020770).

Almost surely, 2^81112131 is an apocalyptic number.

81112131 is a deficient number, since it is larger than the sum of its proper divisors (39054029).

81112131 is a wasteful number, since it uses less digits than its factorization.

81112131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004162 (or 3004156 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

The square root of 81112131 is about 9006.2273455648. The cubic root of 81112131 is about 432.8744344486.

Adding to 81112131 its reverse (13121118), we get a palindrome (94233249).

The spelling of 81112131 in words is "eighty-one million, one hundred twelve thousand, one hundred thirty-one".