81541129050 has 36 divisors (see below), whose sum is σ = 219073834590. Its totient is φ = 21744300960.

The previous prime is 81541128997. The next prime is 81541129067. The reversal of 81541129050 is 5092114518.

It can be written as a sum of positive squares in 3 ways, for example, as 68414156721 + 13126972329 = 261561^2 + 114573^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81541128996 and 81541129014.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 90600805 + ... + 90601704.

Almost surely, 2^81541129050 is an apocalyptic number.

81541129050 is an abundant number, since it is smaller than the sum of its proper divisors (137532705540).

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

81541129050 is a wasteful number, since it uses less digits than its factorization.

81541129050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181202527 (or 181202519 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The spelling of 81541129050 in words is "eighty-one billion, five hundred forty-one million, one hundred twenty-nine thousand, fifty".