81014705391 has 16 divisors (see below), whose sum is σ = 110067846624. Its totient is φ = 52985871744.

The previous prime is 81014705371. The next prime is 81014705407. The reversal of 81014705391 is 19350741018.

It is not a de Polignac number, because 81014705391 - 2⁶ = 81014705327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81014705371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2700325 + ... + 2730161.

It is an arithmetic number, because the mean of its divisors is an integer number (6879240414).

Almost surely, 2^81014705391 is an apocalyptic number.

81014705391 is a deficient number, since it is larger than the sum of its proper divisors (29053141233).

81014705391 is a wasteful number, since it uses less digits than its factorization.

81014705391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46970.

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 81014705391 in words is "eighty-one billion, fourteen million, seven hundred five thousand, three hundred ninety-one".