81188102 has 16 divisors (see below), whose sum is σ = 129442560. Its totient is φ = 38082312.

The previous prime is 81188089. The next prime is 81188111. The reversal of 81188102 is 20188118.

It is a congruent number.

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, 6458 + ... + 14285.

It is an arithmetic number, because the mean of its divisors is an integer number (8090160).

Almost surely, 2^81188102 is an apocalyptic number.

81188102 is a deficient number, since it is larger than the sum of its proper divisors (48254458).

81188102 is a wasteful number, since it uses less digits than its factorization.

81188102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20867.

The product of its (nonzero) digits is 1024, while the sum is 29.

The square root of 81188102 is about 9010.4440512108. Note that the first 3 decimals coincide. The cubic root of 81188102 is about 433.0095381273.

The spelling of 81188102 in words is "eighty-one million, one hundred eighty-eight thousand, one hundred two".