81111196 has 24 divisors (see below), whose sum is σ = 144408320. Its totient is φ = 39856752.

The previous prime is 81111193. The next prime is 81111197. The reversal of 81111196 is 69111118.

It is a super-2 number, since 2×81111196² = 13158052233100832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81111193) 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, 88975 + ... + 89881.

Almost surely, 2^81111196 is an apocalyptic number.

It is an amenable number.

81111196 is a deficient number, since it is larger than the sum of its proper divisors (63297124).

81111196 is a wasteful number, since it uses less digits than its factorization.

81111196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273 (or 1271 counting only the distinct ones).

The product of its digits is 432, while the sum is 28.

The square root of 81111196 is about 9006.1754368877. The cubic root of 81111196 is about 432.8727711580.

The spelling of 81111196 in words is "eighty-one million, one hundred eleven thousand, one hundred ninety-six".