81107929141 has 8 divisors (see below), whose sum is σ = 85987134464. Its totient is φ = 76370150160.

The previous prime is 81107929139. The next prime is 81107929159. The reversal of 81107929141 is 14192970118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81107929141 - 2¹ = 81107929139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81107929121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35355405 + ... + 35357698.

It is an arithmetic number, because the mean of its divisors is an integer number (10748391808).

Almost surely, 2^81107929141 is an apocalyptic number.

It is an amenable number.

81107929141 is a deficient number, since it is larger than the sum of its proper divisors (4879205323).

81107929141 is a wasteful number, since it uses less digits than its factorization.

81107929141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70713171.

The product of its (nonzero) digits is 36288, while the sum is 43.

The spelling of 81107929141 in words is "eighty-one billion, one hundred seven million, nine hundred twenty-nine thousand, one hundred forty-one".