1111210001989 has 2 divisors, whose sum is σ = 1111210001990. Its totient is φ = 1111210001988.

The previous prime is 1111210001987. The next prime is 1111210002041. The reversal of 1111210001989 is 9891000121111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 570352717089 + 540857284900 = 755217^2 + 735430^2 .

It is an emirp because it is prime and its reverse (9891000121111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1111210001989 - 2¹ = 1111210001987 is a prime.

It is a super-2 number, since 2×1111210001989² (a number of 25 digits) contains 22 as substring.

Together with 1111210001987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111210001983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555605000994 + 555605000995.

It is an arithmetic number, because the mean of its divisors is an integer number (555605000995).

Almost surely, 2^{1111210001989} is an apocalyptic number.

It is an amenable number.

1111210001989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111210001989 is an equidigital number, since it uses as much as digits as its factorization.

1111210001989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 34.

The spelling of 1111210001989 in words is "one trillion, one hundred eleven billion, two hundred ten million, one thousand, nine hundred eighty-nine".