1211303001989 has 2 divisors, whose sum is σ = 1211303001990. Its totient is φ = 1211303001988.

The previous prime is 1211303001943. The next prime is 1211303002003. The reversal of 1211303001989 is 9891003031121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1198549817089 + 12753184900 = 1094783^2 + 112930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211303001989 is a prime.

It is a super-2 number, since 2×1211303001989² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211303001289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605651500994 + 605651500995.

It is an arithmetic number, because the mean of its divisors is an integer number (605651500995).

Almost surely, 2^{1211303001989} is an apocalyptic number.

It is an amenable number.

1211303001989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211303001989 is an equidigital number, since it uses as much as digits as its factorization.

1211303001989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 1211303001989 in words is "one trillion, two hundred eleven billion, three hundred three million, one thousand, nine hundred eighty-nine".