101916805 has 4 divisors (see below), whose sum is σ = 122300172. Its totient is φ = 81533440.

The previous prime is 101916803. The next prime is 101916823. The reversal of 101916805 is 508619101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508619101 = 47 ⋅10821683.

It can be written as a sum of positive squares in 2 ways, for example, as 62188996 + 39727809 = 7886^2 + 6303^2 .

It is not a de Polignac number, because 101916805 - 2¹ = 101916803 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101916803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10191676 + ... + 10191685.

It is an arithmetic number, because the mean of its divisors is an integer number (30575043).

Almost surely, 2^101916805 is an apocalyptic number.

It is an amenable number.

101916805 is a deficient number, since it is larger than the sum of its proper divisors (20383367).

101916805 is an equidigital number, since it uses as much as digits as its factorization.

101916805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20383366.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 101916805 is about 10095.3853319227. The cubic root of 101916805 is about 467.1058074369.

The spelling of 101916805 in words is "one hundred one million, nine hundred sixteen thousand, eight hundred five".