81850107 has 8 divisors (see below), whose sum is σ = 109587280. Its totient is φ = 54339840.

The previous prime is 81850099. The next prime is 81850117. The reversal of 81850107 is 70105818.

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

It is not a de Polignac number, because 81850107 - 2³ = 81850099 is a prime.

It is a super-2 number, since 2×81850107² = 13398880031822898, which contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81850117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55882 + ... + 57327.

It is an arithmetic number, because the mean of its divisors is an integer number (13698410).

Almost surely, 2^81850107 is an apocalyptic number.

81850107 is a deficient number, since it is larger than the sum of its proper divisors (27737173).

81850107 is a wasteful number, since it uses less digits than its factorization.

81850107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113453.

The product of its (nonzero) digits is 2240, while the sum is 30.

The square root of 81850107 is about 9047.1048960427. The cubic root of 81850107 is about 434.1832686739.

The spelling of 81850107 in words is "eighty-one million, eight hundred fifty thousand, one hundred seven".