81545502 has 8 divisors (see below), whose sum is σ = 163091016. Its totient is φ = 27181832.

The previous prime is 81545489. The next prime is 81545507. The reversal of 81545502 is 20554518.

It is a sphenic number, since it is the product of 3 distinct primes.

81545502 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 81545502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81545507) 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, 6795453 + ... + 6795464.

It is an arithmetic number, because the mean of its divisors is an integer number (20386377).

Almost surely, 2^81545502 is an apocalyptic number.

81545502 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81545502 is a wasteful number, since it uses less digits than its factorization.

81545502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13590922.

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 81545502 is about 9030.2548136805. The cubic root of 81545502 is about 433.6439951127.

The spelling of 81545502 in words is "eighty-one million, five hundred forty-five thousand, five hundred two".