809519479 has 2 divisors, whose sum is σ = 809519480. Its totient is φ = 809519478.

The previous prime is 809519467. The next prime is 809519531. The reversal of 809519479 is 974915908.

It is an a-pointer prime, because the next prime (809519531) can be obtained adding 809519479 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 809519479 - 2¹⁹ = 808995191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809519449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404759739 + 404759740.

It is an arithmetic number, because the mean of its divisors is an integer number (404759740).

Almost surely, 2^809519479 is an apocalyptic number.

809519479 is a deficient number, since it is larger than the sum of its proper divisors (1).

809519479 is an equidigital number, since it uses as much as digits as its factorization.

809519479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 809519479 is about 28452.0557956714. The cubic root of 809519479 is about 931.9853831664.

The spelling of 809519479 in words is "eight hundred nine million, five hundred nineteen thousand, four hundred seventy-nine".