81271301232 has 320 divisors, whose sum is σ = 238664724480. Its totient is φ = 23622297600.

The previous prime is 81271301207. The next prime is 81271301257. The reversal of 81271301232 is 23210317218.

It is an interprime number because it is at equal distance from previous prime (81271301207) and next prime (81271301257).

It is a self number, because there is not a number n which added to its sum of digits gives 81271301232.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 261322357 + ... + 261322667.

It is an arithmetic number, because the mean of its divisors is an integer number (745827264).

Almost surely, 2^81271301232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81271301232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119332362240).

81271301232 is an abundant number, since it is smaller than the sum of its proper divisors (157393423248).

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

81271301232 is a wasteful number, since it uses less digits than its factorization.

81271301232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572 (or 566 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The spelling of 81271301232 in words is "eighty-one billion, two hundred seventy-one million, three hundred one thousand, two hundred thirty-two".