11211312989 has 2 divisors, whose sum is σ = 11211312990. Its totient is φ = 11211312988.

The previous prime is 11211312979. The next prime is 11211313021. The reversal of 11211312989 is 98921311211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5935469764 + 5275843225 = 77042^2 + 72635^2 .

It is an emirp because it is prime and its reverse (98921311211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11211312989 - 2⁸ = 11211312733 is a prime.

It is a super-2 number, since 2×11211312989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211312979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605656494 + 5605656495.

It is an arithmetic number, because the mean of its divisors is an integer number (5605656495).

Almost surely, 2^11211312989 is an apocalyptic number.

It is an amenable number.

11211312989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211312989 is an equidigital number, since it uses as much as digits as its factorization.

11211312989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 38.

The spelling of 11211312989 in words is "eleven billion, two hundred eleven million, three hundred twelve thousand, nine hundred eighty-nine".