855265009 has 2 divisors, whose sum is σ = 855265010. Its totient is φ = 855265008.

The previous prime is 855264997. The next prime is 855265067. The reversal of 855265009 is 900562558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 807696400 + 47568609 = 28420^2 + 6897^2 .

It is a cyclic number.

It is not a de Polignac number, because 855265009 - 2⁷ = 855264881 is a prime.

It is a Chen prime.

It is equal to p_43837942 and since 855265009 and 43837942 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (855065009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427632504 + 427632505.

It is an arithmetic number, because the mean of its divisors is an integer number (427632505).

Almost surely, 2^855265009 is an apocalyptic number.

It is an amenable number.

855265009 is a deficient number, since it is larger than the sum of its proper divisors (1).

855265009 is an equidigital number, since it uses as much as digits as its factorization.

855265009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 855265009 is about 29244.9142416250. The cubic root of 855265009 is about 949.2200464417.

The spelling of 855265009 in words is "eight hundred fifty-five million, two hundred sixty-five thousand, nine".