809774513 has 2 divisors, whose sum is σ = 809774514. Its totient is φ = 809774512.

The previous prime is 809774461. The next prime is 809774561. The reversal of 809774513 is 315477908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 809288704 + 485809 = 28448^2 + 697^2 .

It is a cyclic number.

It is not a de Polignac number, because 809774513 - 2¹⁴ = 809758129 is a prime.

It is not a weakly prime, because it can be changed into another prime (809770513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404887256 + 404887257.

It is an arithmetic number, because the mean of its divisors is an integer number (404887257).

Almost surely, 2^809774513 is an apocalyptic number.

It is an amenable number.

809774513 is a deficient number, since it is larger than the sum of its proper divisors (1).

809774513 is an equidigital number, since it uses as much as digits as its factorization.

809774513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 809774513 is about 28456.5372629911. The cubic root of 809774513 is about 932.0832449268.

The spelling of 809774513 in words is "eight hundred nine million, seven hundred seventy-four thousand, five hundred thirteen".