81135300 has 36 divisors (see below), whose sum is σ = 234752336. Its totient is φ = 21636000.

The previous prime is 81135293. The next prime is 81135317. The reversal of 81135300 is 353118.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134926 + ... + 135525.

Almost surely, 2^81135300 is an apocalyptic number.

It is an amenable number.

81135300 is an abundant number, since it is smaller than the sum of its proper divisors (153617036).

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

81135300 is a wasteful number, since it uses less digits than its factorization.

81135300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270468 (or 270461 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 81135300 is about 9007.5135303812. The cubic root of 81135300 is about 432.9156461756.

Adding to 81135300 its reverse (353118), we get a palindrome (81488418).

The spelling of 81135300 in words is "eighty-one million, one hundred thirty-five thousand, three hundred".