81500552 has 16 divisors (see below), whose sum is σ = 174644160. Its totient is φ = 34928784.

The previous prime is 81500521. The next prime is 81500561. The reversal of 81500552 is 25500518.

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 3 ways as a sum of consecutive naturals, for example, 727628 + ... + 727739.

It is an arithmetic number, because the mean of its divisors is an integer number (10915260).

Almost surely, 2^81500552 is an apocalyptic number.

It is an amenable number.

81500552 is an abundant number, since it is smaller than the sum of its proper divisors (93143608).

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

81500552 is a wasteful number, since it uses less digits than its factorization.

81500552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455380 (or 1455376 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 81500552 is about 9027.7656150345. The cubic root of 81500552 is about 433.5643018545.

The spelling of 81500552 in words is "eighty-one million, five hundred thousand, five hundred fifty-two".