81071871211 has 8 divisors (see below), whose sum is σ = 82241913600. Its totient is φ = 79902611880.

The previous prime is 81071871197. The next prime is 81071871259. The reversal of 81071871211 is 11217817018.

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 81071871211 - 2²¹ = 81069774059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81071871281) 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, 14410 + ... + 402928.

It is an arithmetic number, because the mean of its divisors is an integer number (10280239200).

Almost surely, 2^81071871211 is an apocalyptic number.

81071871211 is a deficient number, since it is larger than the sum of its proper divisors (1170042389).

81071871211 is a wasteful number, since it uses less digits than its factorization.

81071871211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391529.

The product of its (nonzero) digits is 6272, while the sum is 37.

The spelling of 81071871211 in words is "eighty-one billion, seventy-one million, eight hundred seventy-one thousand, two hundred eleven".