809360197 has 4 divisors (see below), whose sum is σ = 810600300. Its totient is φ = 808120096.

The previous prime is 809360177. The next prime is 809360203. The reversal of 809360197 is 791063908.

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 94653441 + 714706756 = 9729^2 + 26734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809360197 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 (809360107) 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, 619072 + ... + 620377.

It is an arithmetic number, because the mean of its divisors is an integer number (202650075).

Almost surely, 2^809360197 is an apocalyptic number.

It is an amenable number.

809360197 is a deficient number, since it is larger than the sum of its proper divisors (1240103).

809360197 is a wasteful number, since it uses less digits than its factorization.

809360197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240102.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 809360197 is about 28449.2565280712. The cubic root of 809360197 is about 931.9242529787.

The spelling of 809360197 in words is "eight hundred nine million, three hundred sixty thousand, one hundred ninety-seven".