81479173229 has 8 divisors (see below), whose sum is σ = 83828402040. Its totient is φ = 79137686016.

The previous prime is 81479173207. The next prime is 81479173253. The reversal of 81479173229 is 92237197418.

It can be written as a sum of positive squares in 4 ways, for example, as 18880134025 + 62599039204 = 137405^2 + 250198^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81479173229 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 (81479173289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1914044 + ... + 1956149.

It is an arithmetic number, because the mean of its divisors is an integer number (10478550255).

Almost surely, 2^81479173229 is an apocalyptic number.

It is an amenable number.

81479173229 is a deficient number, since it is larger than the sum of its proper divisors (2349228811).

81479173229 is a wasteful number, since it uses less digits than its factorization.

81479173229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3870799.

The product of its digits is 1524096, while the sum is 53.

The spelling of 81479173229 in words is "eighty-one billion, four hundred seventy-nine million, one hundred seventy-three thousand, two hundred twenty-nine".