1200100202009 has 2 divisors, whose sum is σ = 1200100202010. Its totient is φ = 1200100202008.

The previous prime is 1200100201969. The next prime is 1200100202011. The reversal of 1200100202009 is 9002020010021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1198050648025 + 2049553984 = 1094555^2 + 45272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200100202009 is a prime.

Together with 1200100202011, 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 (1200100202039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600050101004 + 600050101005.

It is an arithmetic number, because the mean of its divisors is an integer number (600050101005).

Almost surely, 2^{1200100202009} is an apocalyptic number.

It is an amenable number.

1200100202009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200100202009 is an equidigital number, since it uses as much as digits as its factorization.

1200100202009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 1200100202009 in words is "one trillion, two hundred billion, one hundred million, two hundred two thousand, nine".