81941142142 has 16 divisors (see below), whose sum is σ = 128436648480. Its totient is φ = 39133952352.

The previous prime is 81941142109. The next prime is 81941142149. The reversal of 81941142142 is 24124114918.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1223613 + ... + 1288840.

It is an arithmetic number, because the mean of its divisors is an integer number (8027290530).

Almost surely, 2^81941142142 is an apocalyptic number.

81941142142 is a deficient number, since it is larger than the sum of its proper divisors (46495506338).

81941142142 is a wasteful number, since it uses less digits than its factorization.

81941142142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2513187.

The product of its digits is 18432, while the sum is 37.

The spelling of 81941142142 in words is "eighty-one billion, nine hundred forty-one million, one hundred forty-two thousand, one hundred forty-two".