809577091 has 2 divisors, whose sum is σ = 809577092. Its totient is φ = 809577090.

The previous prime is 809577073. The next prime is 809577133. The reversal of 809577091 is 190775908.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 809577091 - 2¹³ = 809568899 is a prime.

It is not a weakly prime, because it can be changed into another prime (809577001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404788545 + 404788546.

It is an arithmetic number, because the mean of its divisors is an integer number (404788546).

Almost surely, 2^809577091 is an apocalyptic number.

809577091 is a deficient number, since it is larger than the sum of its proper divisors (1).

809577091 is an equidigital number, since it uses as much as digits as its factorization.

809577091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 809577091 is about 28453.0682176808. The cubic root of 809577091 is about 932.0074918657.

The spelling of 809577091 in words is "eight hundred nine million, five hundred seventy-seven thousand, ninety-one".