81941142143 has 12 divisors (see below), whose sum is σ = 95379065352. Its totient is φ = 70191218160.

The previous prime is 81941142109. The next prime is 81941142149. The reversal of 81941142143 is 34124114918.

It is not a de Polignac number, because 81941142143 - 2²⁶ = 81874033279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81941142097 and 81941142106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81941142149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 445313 + ... + 601818.

It is an arithmetic number, because the mean of its divisors is an integer number (7948255446).

Almost surely, 2^81941142143 is an apocalyptic number.

81941142143 is a deficient number, since it is larger than the sum of its proper divisors (13437923209).

81941142143 is a wasteful number, since it uses less digits than its factorization.

81941142143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048742 (or 1048735 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The spelling of 81941142143 in words is "eighty-one billion, nine hundred forty-one million, one hundred forty-two thousand, one hundred forty-three".