81074169239 has 16 divisors (see below), whose sum is σ = 93034191360. Its totient is φ = 69209220960.

The previous prime is 81074169229. The next prime is 81074169251. The reversal of 81074169239 is 93296147018.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81074169239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81074169229) 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, 1706669 + ... + 1753529.

It is an arithmetic number, because the mean of its divisors is an integer number (5814636960).

Almost surely, 2^81074169239 is an apocalyptic number.

81074169239 is a deficient number, since it is larger than the sum of its proper divisors (11960022121).

81074169239 is a wasteful number, since it uses less digits than its factorization.

81074169239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47870.

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 81074169239 in words is "eighty-one billion, seventy-four million, one hundred sixty-nine thousand, two hundred thirty-nine".