808804561 has 2 divisors, whose sum is σ = 808804562. Its totient is φ = 808804560.

The previous prime is 808804553. The next prime is 808804573. The reversal of 808804561 is 165408808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 471714961 + 337089600 = 21719^2 + 18360^2 .

It is a cyclic number.

It is not a de Polignac number, because 808804561 - 2³ = 808804553 is a prime.

It is not a weakly prime, because it can be changed into another prime (808805561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404402280 + 404402281.

It is an arithmetic number, because the mean of its divisors is an integer number (404402281).

Almost surely, 2^808804561 is an apocalyptic number.

It is an amenable number.

808804561 is a deficient number, since it is larger than the sum of its proper divisors (1).

808804561 is an equidigital number, since it uses as much as digits as its factorization.

808804561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 808804561 is about 28439.4894644753. The cubic root of 808804561 is about 931.7109449007.

The spelling of 808804561 in words is "eight hundred eight million, eight hundred four thousand, five hundred sixty-one".