81541480 has 16 divisors (see below), whose sum is σ = 183468420. Its totient is φ = 32616576.

The previous prime is 81541477. The next prime is 81541487. The reversal of 81541480 is 8414518.

It can be written as a sum of positive squares in 2 ways, for example, as 81324324 + 217156 = 9018^2 + 466^2 .

It is not an unprimeable number, because it can be changed into a prime (81541487) 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 3 ways as a sum of consecutive naturals, for example, 1019229 + ... + 1019308.

Almost surely, 2^81541480 is an apocalyptic number.

It is an amenable number.

81541480 is an abundant number, since it is smaller than the sum of its proper divisors (101926940).

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

81541480 is a wasteful number, since it uses less digits than its factorization.

81541480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038548 (or 2038544 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 81541480 is about 9030.0321151145. The cubic root of 81541480 is about 433.6368655765.

Adding to 81541480 its reverse (8414518), we get a palindrome (89955998).

The spelling of 81541480 in words is "eighty-one million, five hundred forty-one thousand, four hundred eighty".