200912009 has 2 divisors, whose sum is σ = 200912010. Its totient is φ = 200912008.

The previous prime is 200912003. The next prime is 200912011. The reversal of 200912009 is 900219002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200137609 + 774400 = 14147^2 + 880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200912009 is a prime.

Together with 200912011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (200912003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100456004 + 100456005.

It is an arithmetic number, because the mean of its divisors is an integer number (100456005).

Almost surely, 2^200912009 is an apocalyptic number.

It is an amenable number.

200912009 is a deficient number, since it is larger than the sum of its proper divisors (1).

200912009 is an equidigital number, since it uses as much as digits as its factorization.

200912009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 200912009 is about 14174.3433357599. The cubic root of 200912009 is about 585.6911100629.

The spelling of 200912009 in words is "two hundred million, nine hundred twelve thousand, nine".