81084071051 has 4 divisors (see below), whose sum is σ = 82458377400. Its totient is φ = 79709764704.

The previous prime is 81084071041. The next prime is 81084071059. The reversal of 81084071051 is 15017048018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81084071051 - 2¹⁸ = 81083808907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81084071059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687153086 + ... + 687153203.

It is an arithmetic number, because the mean of its divisors is an integer number (20614594350).

Almost surely, 2^81084071051 is an apocalyptic number.

81084071051 is a deficient number, since it is larger than the sum of its proper divisors (1374306349).

81084071051 is a wasteful number, since it uses less digits than its factorization.

81084071051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374306348.

The product of its (nonzero) digits is 8960, while the sum is 35.

The spelling of 81084071051 in words is "eighty-one billion, eighty-four million, seventy-one thousand, fifty-one".