849090509 has 2 divisors, whose sum is σ = 849090510. Its totient is φ = 849090508.

The previous prime is 849090497. The next prime is 849090553. The reversal of 849090509 is 905090948.

It is an a-pointer prime, because the next prime (849090553) can be obtained adding 849090509 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 624750025 + 224340484 = 24995^2 + 14978^2 .

It is a cyclic number.

It is not a de Polignac number, because 849090509 - 2¹⁶ = 849024973 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 849090509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (849090559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424545254 + 424545255.

It is an arithmetic number, because the mean of its divisors is an integer number (424545255).

Almost surely, 2^849090509 is an apocalyptic number.

It is an amenable number.

849090509 is a deficient number, since it is larger than the sum of its proper divisors (1).

849090509 is an equidigital number, since it uses as much as digits as its factorization.

849090509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 849090509 is about 29139.1576576949. The cubic root of 849090509 is about 946.9302609523.

The spelling of 849090509 in words is "eight hundred forty-nine million, ninety thousand, five hundred nine".