81154316239 has 8 divisors (see below), whose sum is σ = 83846433920. Its totient is φ = 78466838400.

The previous prime is 81154316237. The next prime is 81154316251. The reversal of 81154316239 is 93261345118.

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 81154316239 - 2¹ = 81154316237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81154316195 and 81154316204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81154316237) 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, 1124382 + ... + 1194379.

It is an arithmetic number, because the mean of its divisors is an integer number (10480804240).

Almost surely, 2^81154316239 is an apocalyptic number.

81154316239 is a deficient number, since it is larger than the sum of its proper divisors (2692117681).

81154316239 is a wasteful number, since it uses less digits than its factorization.

81154316239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319921.

The product of its digits is 155520, while the sum is 43.

The spelling of 81154316239 in words is "eighty-one billion, one hundred fifty-four million, three hundred sixteen thousand, two hundred thirty-nine".