809850101 has 4 divisors (see below), whose sum is σ = 820944012. Its totient is φ = 798756192.

The previous prime is 809850077. The next prime is 809850103. The reversal of 809850101 is 101058908.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 296872900 + 512977201 = 17230^2 + 22649^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809850101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809850103) 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, 5546846 + ... + 5546991.

It is an arithmetic number, because the mean of its divisors is an integer number (205236003).

Almost surely, 2^809850101 is an apocalyptic number.

It is an amenable number.

809850101 is a deficient number, since it is larger than the sum of its proper divisors (11093911).

809850101 is a wasteful number, since it uses less digits than its factorization.

809850101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11093910.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 809850101 is about 28457.8653626726. The cubic root of 809850101 is about 932.1122456404.

The spelling of 809850101 in words is "eight hundred nine million, eight hundred fifty thousand, one hundred one".