809677213 has 2 divisors, whose sum is σ = 809677214. Its totient is φ = 809677212.

The previous prime is 809677199. The next prime is 809677223. The reversal of 809677213 is 312776908.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 636149284 + 173527929 = 25222^2 + 13173^2 .

It is a cyclic number.

It is not a de Polignac number, because 809677213 - 2¹⁷ = 809546141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 809677213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809677223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404838606 + 404838607.

It is an arithmetic number, because the mean of its divisors is an integer number (404838607).

Almost surely, 2^809677213 is an apocalyptic number.

It is an amenable number.

809677213 is a deficient number, since it is larger than the sum of its proper divisors (1).

809677213 is an equidigital number, since it uses as much as digits as its factorization.

809677213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 809677213 is about 28454.8275868964. The cubic root of 809677213 is about 932.0459113519.

The spelling of 809677213 in words is "eight hundred nine million, six hundred seventy-seven thousand, two hundred thirteen".