1200201011917 has 2 divisors, whose sum is σ = 1200201011918. Its totient is φ = 1200201011916.

The previous prime is 1200201011899. The next prime is 1200201012007. The reversal of 1200201011917 is 7191101020021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1195919403561 + 4281608356 = 1093581^2 + 65434^2 .

It is an emirp because it is prime and its reverse (7191101020021) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200201011917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200201011891 and 1200201011900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200201011717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600100505958 + 600100505959.

It is an arithmetic number, because the mean of its divisors is an integer number (600100505959).

Almost surely, 2^{1200201011917} is an apocalyptic number.

It is an amenable number.

1200201011917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200201011917 is an equidigital number, since it uses as much as digits as its factorization.

1200201011917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 25.

Adding to 1200201011917 its reverse (7191101020021), we get a palindrome (8391302031938).

The spelling of 1200201011917 in words is "one trillion, two hundred billion, two hundred one million, eleven thousand, nine hundred seventeen".