81039562111 has 8 divisors (see below), whose sum is σ = 83899410480. Its totient is φ = 78184072512.

The previous prime is 81039562103. The next prime is 81039562133. The reversal of 81039562111 is 11126593018.

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 81039562111 - 2³ = 81039562103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81039562811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1051830 + ... + 1126243.

It is an arithmetic number, because the mean of its divisors is an integer number (10487426310).

Almost surely, 2^81039562111 is an apocalyptic number.

81039562111 is a deficient number, since it is larger than the sum of its proper divisors (2859848369).

81039562111 is a wasteful number, since it uses less digits than its factorization.

81039562111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2179385.

The product of its (nonzero) digits is 12960, while the sum is 37.

The spelling of 81039562111 in words is "eighty-one billion, thirty-nine million, five hundred sixty-two thousand, one hundred eleven".