81141270 has 64 divisors (see below), whose sum is σ = 227321856. Its totient is φ = 18149760.

The previous prime is 81141257. The next prime is 81141271. The reversal of 81141270 is 7214118.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81141270.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81141271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5760 + ... + 13980.

It is an arithmetic number, because the mean of its divisors is an integer number (3551904).

Almost surely, 2^81141270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81141270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113660928).

81141270 is an abundant number, since it is smaller than the sum of its proper divisors (146180586).

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

81141270 is a wasteful number, since it uses less digits than its factorization.

81141270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8285.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 81141270 is about 9007.8449142955. The cubic root of 81141270 is about 432.9262640079.

Adding to 81141270 its reverse (7214118), we get a palindrome (88355388).

The spelling of 81141270 in words is "eighty-one million, one hundred forty-one thousand, two hundred seventy".