850880509 has 2 divisors, whose sum is σ = 850880510. Its totient is φ = 850880508.

The previous prime is 850880507. The next prime is 850880519. The reversal of 850880509 is 905088058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 842740900 + 8139609 = 29030^2 + 2853^2 .

It is a cyclic number.

It is not a de Polignac number, because 850880509 - 2¹ = 850880507 is a prime.

Together with 850880507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (850880507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425440254 + 425440255.

It is an arithmetic number, because the mean of its divisors is an integer number (425440255).

Almost surely, 2^850880509 is an apocalyptic number.

It is an amenable number.

850880509 is a deficient number, since it is larger than the sum of its proper divisors (1).

850880509 is an equidigital number, since it uses as much as digits as its factorization.

850880509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 43.

The square root of 850880509 is about 29169.8561703688. The cubic root of 850880509 is about 947.5952138011.

The spelling of 850880509 in words is "eight hundred fifty million, eight hundred eighty thousand, five hundred nine".