81849129 has 8 divisors (see below), whose sum is σ = 110921472. Its totient is φ = 53671440.

The previous prime is 81849091. The next prime is 81849149. The reversal of 81849129 is 92194818.

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

It is not a de Polignac number, because 81849129 - 2⁹ = 81848617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81849149) 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 7 ways as a sum of consecutive naturals, for example, 223449 + ... + 223814.

It is an arithmetic number, because the mean of its divisors is an integer number (13865184).

Almost surely, 2^81849129 is an apocalyptic number.

It is an amenable number.

81849129 is a deficient number, since it is larger than the sum of its proper divisors (29072343).

81849129 is a wasteful number, since it uses less digits than its factorization.

81849129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447327.

The product of its digits is 41472, while the sum is 42.

The square root of 81849129 is about 9047.0508454413. The cubic root of 81849129 is about 434.1815393627.

The spelling of 81849129 in words is "eighty-one million, eight hundred forty-nine thousand, one hundred twenty-nine".