81130532 has 24 divisors (see below), whose sum is σ = 170802240. Its totient is φ = 32940000.

The previous prime is 81130519. The next prime is 81130541. The reversal of 81130532 is 23503118.

It is a junction number, because it is equal to n+sod(n) for n = 81130498 and 81130507.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 75719 + ... + 76782.

It is an arithmetic number, because the mean of its divisors is an integer number (7116760).

Almost surely, 2^81130532 is an apocalyptic number.

It is an amenable number.

81130532 is an abundant number, since it is smaller than the sum of its proper divisors (89671708).

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

81130532 is a wasteful number, since it uses less digits than its factorization.

81130532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152531 (or 152529 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 81130532 is about 9007.2488585583. The cubic root of 81130532 is about 432.9071657640.

The spelling of 81130532 in words is "eighty-one million, one hundred thirty thousand, five hundred thirty-two".