849101009 has 2 divisors, whose sum is σ = 849101010. Its totient is φ = 849101008.

The previous prime is 849101003. The next prime is 849101017. The reversal of 849101009 is 900101948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627001600 + 222099409 = 25040^2 + 14903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-849101009 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (849101003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424550504 + 424550505.

It is an arithmetic number, because the mean of its divisors is an integer number (424550505).

Almost surely, 2^849101009 is an apocalyptic number.

It is an amenable number.

849101009 is a deficient number, since it is larger than the sum of its proper divisors (1).

849101009 is an equidigital number, since it uses as much as digits as its factorization.

849101009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 849101009 is about 29139.3378270681. The cubic root of 849101009 is about 946.9341642373.

The spelling of 849101009 in words is "eight hundred forty-nine million, one hundred one thousand, nine".