809964901 has 2 divisors, whose sum is σ = 809964902. Its totient is φ = 809964900.

The previous prime is 809964877. The next prime is 809964973. The reversal of 809964901 is 109469908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 776959876 + 33005025 = 27874^2 + 5745^2 .

It is a cyclic number.

It is not a de Polignac number, because 809964901 - 2¹³ = 809956709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809964401) 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, 404982450 + 404982451.

It is an arithmetic number, because the mean of its divisors is an integer number (404982451).

Almost surely, 2^809964901 is an apocalyptic number.

It is an amenable number.

809964901 is a deficient number, since it is larger than the sum of its proper divisors (1).

809964901 is an equidigital number, since it uses as much as digits as its factorization.

809964901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 809964901 is about 28459.8823082598. The cubic root of 809964901 is about 932.1562873011.

The spelling of 809964901 in words is "eight hundred nine million, nine hundred sixty-four thousand, nine hundred one".