1200211997 has 2 divisors, whose sum is σ = 1200211998. Its totient is φ = 1200211996.

The previous prime is 1200211993. The next prime is 1200212017. The reversal of 1200211997 is 7991120021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1103169796 + 97042201 = 33214^2 + 9851^2 .

It is an emirp because it is prime and its reverse (7991120021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200211997 - 2² = 1200211993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200211993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600105998 + 600105999.

It is an arithmetic number, because the mean of its divisors is an integer number (600105999).

Almost surely, 2^1200211997 is an apocalyptic number.

It is an amenable number.

1200211997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200211997 is an equidigital number, since it uses as much as digits as its factorization.

1200211997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 1200211997 is about 34644.0759293707. The cubic root of 1200211997 is about 1062.7211433947.

The spelling of 1200211997 in words is "one billion, two hundred million, two hundred eleven thousand, nine hundred ninety-seven".