81111390101 has 8 divisors (see below), whose sum is σ = 93428643840. Its totient is φ = 68976614448.

The previous prime is 81111390053. The next prime is 81111390133. The reversal of 81111390101 is 10109311118.

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

It is a de Polignac number, because none of the positive numbers 2^k-81111390101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81111390901) 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, 45618566 + ... + 45620343.

It is an arithmetic number, because the mean of its divisors is an integer number (11678580480).

Almost surely, 2^81111390101 is an apocalyptic number.

It is an amenable number.

81111390101 is a deficient number, since it is larger than the sum of its proper divisors (12317253739).

81111390101 is a wasteful number, since it uses less digits than its factorization.

81111390101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91239043.

The product of its (nonzero) digits is 216, while the sum is 26.

The spelling of 81111390101 in words is "eighty-one billion, one hundred eleven million, three hundred ninety thousand, one hundred one".