81366429 has 8 divisors (see below), whose sum is σ = 109484320. Its totient is φ = 53746416.

The previous prime is 81366421. The next prime is 81366443. The reversal of 81366429 is 92466318.

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

It is not a de Polignac number, because 81366429 - 2³ = 81366421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81366421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124087 + ... + 124740.

It is an arithmetic number, because the mean of its divisors is an integer number (13685540).

Almost surely, 2^81366429 is an apocalyptic number.

It is an amenable number.

81366429 is a deficient number, since it is larger than the sum of its proper divisors (28117891).

81366429 is a wasteful number, since it uses less digits than its factorization.

81366429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248939.

The product of its digits is 62208, while the sum is 39.

The square root of 81366429 is about 9020.3341955828. The cubic root of 81366429 is about 433.3263367049.

The spelling of 81366429 in words is "eighty-one million, three hundred sixty-six thousand, four hundred twenty-nine".