81489166 has 8 divisors (see below), whose sum is σ = 133345944. Its totient is φ = 37040520.

The previous prime is 81489091. The next prime is 81489197. The reversal of 81489166 is 66198418.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1852005 + ... + 1852048.

It is an arithmetic number, because the mean of its divisors is an integer number (16668243).

Almost surely, 2^81489166 is an apocalyptic number.

81489166 is a deficient number, since it is larger than the sum of its proper divisors (51856778).

81489166 is a wasteful number, since it uses less digits than its factorization.

81489166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3704066.

The product of its digits is 82944, while the sum is 43.

The square root of 81489166 is about 9027.1349829279. The cubic root of 81489166 is about 433.5441106086.

The spelling of 81489166 in words is "eighty-one million, four hundred eighty-nine thousand, one hundred sixty-six".