81009572231 has 8 divisors (see below), whose sum is σ = 93964195200. Its totient is φ = 68400406008.

The previous prime is 81009572159. The next prime is 81009572233. The reversal of 81009572231 is 13227590018.

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-81009572231 is a prime.

It is a super-2 number, since 2×81009572231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81009572233) 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, 86363681 + ... + 86364618.

It is an arithmetic number, because the mean of its divisors is an integer number (11745524400).

Almost surely, 2^81009572231 is an apocalyptic number.

81009572231 is a deficient number, since it is larger than the sum of its proper divisors (12954622969).

81009572231 is a wasteful number, since it uses less digits than its factorization.

81009572231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172728373.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 81009572231 in words is "eighty-one billion, nine million, five hundred seventy-two thousand, two hundred thirty-one".