81196143 has 16 divisors (see below), whose sum is σ = 127994880. Its totient is φ = 44797536.

The previous prime is 81196117. The next prime is 81196151. The reversal of 81196143 is 34169118.

It is not a de Polignac number, because 81196143 - 2¹⁷ = 81065071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81196103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66055 + ... + 67272.

It is an arithmetic number, because the mean of its divisors is an integer number (7999680).

Almost surely, 2^81196143 is an apocalyptic number.

81196143 is a deficient number, since it is larger than the sum of its proper divisors (46798737).

81196143 is a wasteful number, since it uses less digits than its factorization.

81196143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133366.

The product of its digits is 5184, while the sum is 33.

The square root of 81196143 is about 9010.8902445874. The cubic root of 81196143 is about 433.0238329753.

The spelling of 81196143 in words is "eighty-one million, one hundred ninety-six thousand, one hundred forty-three".