81041130 has 72 divisors (see below), whose sum is σ = 217955556. Its totient is φ = 20891520.

The previous prime is 81041101. The next prime is 81041131. The reversal of 81041130 is 3114018.

It can be written as a sum of positive squares in 2 ways, for example, as 71622369 + 9418761 = 8463^2 + 3069^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (81041131) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 86022 + ... + 86958.

Almost surely, 2^81041130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81041130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108977778).

81041130 is an abundant number, since it is smaller than the sum of its proper divisors (136914426).

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

81041130 is a wasteful number, since it uses less digits than its factorization.

81041130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012 (or 978 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 81041130 is about 9002.2847100056. The cubic root of 81041130 is about 432.7480929283.

Adding to 81041130 its reverse (3114018), we get a palindrome (84155148).

The spelling of 81041130 in words is "eighty-one million, forty-one thousand, one hundred thirty".