809690201 has 2 divisors, whose sum is σ = 809690202. Its totient is φ = 809690200.

The previous prime is 809690173. The next prime is 809690221. The reversal of 809690201 is 102096908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 687698176 + 121992025 = 26224^2 + 11045^2 .

It is a cyclic number.

It is not a de Polignac number, because 809690201 - 2¹⁴ = 809673817 is a prime.

It is not a weakly prime, because it can be changed into another prime (809690221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404845100 + 404845101.

It is an arithmetic number, because the mean of its divisors is an integer number (404845101).

Almost surely, 2^809690201 is an apocalyptic number.

It is an amenable number.

809690201 is a deficient number, since it is larger than the sum of its proper divisors (1).

809690201 is an equidigital number, since it uses as much as digits as its factorization.

809690201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 809690201 is about 28455.0558073605. The cubic root of 809690201 is about 932.0508949624.

The spelling of 809690201 in words is "eight hundred nine million, six hundred ninety thousand, two hundred one".