81167912 has 24 divisors (see below), whose sum is σ = 177038010. Its totient is φ = 34786080.

The previous prime is 81167909. The next prime is 81167923. The reversal of 81167912 is 21976118.

It can be written as a sum of positive squares in only one way, i.e., 41654116 + 39513796 = 6454^2 + 6286^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103139 + ... + 103922.

Almost surely, 2^81167912 is an apocalyptic number.

It is an amenable number.

81167912 is an abundant number, since it is smaller than the sum of its proper divisors (95870098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81167912 is a wasteful number, since it uses less digits than its factorization.

81167912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207081 (or 207070 counting only the distinct ones).

The product of its digits is 6048, while the sum is 35.

The square root of 81167912 is about 9009.3236150113. The cubic root of 81167912 is about 432.9736412936.

The spelling of 81167912 in words is "eighty-one million, one hundred sixty-seven thousand, nine hundred twelve".