1097211531989 has 2 divisors, whose sum is σ = 1097211531990. Its totient is φ = 1097211531988.

The previous prime is 1097211531967. The next prime is 1097211532057. The reversal of 1097211531989 is 9891351127901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 985761051025 + 111450480964 = 992855^2 + 333842^2 .

It is an emirp because it is prime and its reverse (9891351127901) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1097211531989 is a prime.

It is a super-2 number, since 2×1097211531989² (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 (1097211531389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 548605765994 + 548605765995.

It is an arithmetic number, because the mean of its divisors is an integer number (548605765995).

Almost surely, 2^{1097211531989} is an apocalyptic number.

It is an amenable number.

1097211531989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1097211531989 is an equidigital number, since it uses as much as digits as its factorization.

1097211531989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 56.

The spelling of 1097211531989 in words is "one trillion, ninety-seven billion, two hundred eleven million, five hundred thirty-one thousand, nine hundred eighty-nine".