854910809 has 2 divisors, whose sum is σ = 854910810. Its totient is φ = 854910808.

The previous prime is 854910781. The next prime is 854910857. The reversal of 854910809 is 908019458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 529000000 + 325910809 = 23000^2 + 18053^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-854910809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 854910809.

It is not a weakly prime, because it can be changed into another prime (854910899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427455404 + 427455405.

It is an arithmetic number, because the mean of its divisors is an integer number (427455405).

Almost surely, 2^854910809 is an apocalyptic number.

It is an amenable number.

854910809 is a deficient number, since it is larger than the sum of its proper divisors (1).

854910809 is an equidigital number, since it uses as much as digits as its factorization.

854910809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 854910809 is about 29238.8578607305. The cubic root of 854910809 is about 949.0889914818.

The spelling of 854910809 in words is "eight hundred fifty-four million, nine hundred ten thousand, eight hundred nine".