81031448292 has 48 divisors (see below), whose sum is σ = 199704039360. Its totient is φ = 25501523328.

The previous prime is 81031448261. The next prime is 81031448299. The reversal of 81031448292 is 29284413018.

It is a super-2 number, since 2×81031448292² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81031448299) 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, 539683 + ... + 673290.

It is an arithmetic number, because the mean of its divisors is an integer number (4160500820).

Almost surely, 2^81031448292 is an apocalyptic number.

It is an amenable number.

81031448292 is an abundant number, since it is smaller than the sum of its proper divisors (118672591068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81031448292 is a wasteful number, since it uses less digits than its factorization.

81031448292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213292 (or 1213290 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The spelling of 81031448292 in words is "eighty-one billion, thirty-one million, four hundred forty-eight thousand, two hundred ninety-two".