81634105 has 8 divisors (see below), whose sum is σ = 111955392. Its totient is φ = 55977648.

The previous prime is 81634057. The next prime is 81634121. The reversal of 81634105 is 50143618.

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

It is a cyclic number.

It is not a de Polignac number, because 81634105 - 2⁷ = 81633977 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1166167 + ... + 1166236.

It is an arithmetic number, because the mean of its divisors is an integer number (13994424).

Almost surely, 2^81634105 is an apocalyptic number.

It is an amenable number.

81634105 is a deficient number, since it is larger than the sum of its proper divisors (30321287).

81634105 is a wasteful number, since it uses less digits than its factorization.

81634105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332415.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 81634105 is about 9035.1593787824. The cubic root of 81634105 is about 433.8009964208.

Subtracting from 81634105 its product of nonzero digits (2880), we obtain a square (81631225 = 9035²).

The spelling of 81634105 in words is "eighty-one million, six hundred thirty-four thousand, one hundred five".