81429166 has 32 divisors (see below), whose sum is σ = 151377408. Its totient is φ = 31989600.

The previous prime is 81429137. The next prime is 81429181. The reversal of 81429166 is 66192418.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 26001 + ... + 28963.

It is an arithmetic number, because the mean of its divisors is an integer number (4730544).

Almost surely, 2^81429166 is an apocalyptic number.

81429166 is a deficient number, since it is larger than the sum of its proper divisors (69948242).

81429166 is a wasteful number, since it uses less digits than its factorization.

81429166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3136.

The product of its digits is 20736, while the sum is 37.

The square root of 81429166 is about 9023.8110574191. The cubic root of 81429166 is about 433.4376791452.

The spelling of 81429166 in words is "eighty-one million, four hundred twenty-nine thousand, one hundred sixty-six".