1211222989 has 2 divisors, whose sum is σ = 1211222990. Its totient is φ = 1211222988.

The previous prime is 1211222959. The next prime is 1211223037. The reversal of 1211222989 is 9892221121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1109556100 + 101666889 = 33310^2 + 10083^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211222989 - 2¹⁹ = 1210698701 is a prime.

It is a super-2 number, since 2×1211222989² = 2934122258164188242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211222959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605611494 + 605611495.

It is an arithmetic number, because the mean of its divisors is an integer number (605611495).

Almost surely, 2^1211222989 is an apocalyptic number.

It is an amenable number.

1211222989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211222989 is an equidigital number, since it uses as much as digits as its factorization.

1211222989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 37.

The square root of 1211222989 is about 34802.6290529897. The cubic root of 1211222989 is about 1065.9611296015.

The spelling of 1211222989 in words is "one billion, two hundred eleven million, two hundred twenty-two thousand, nine hundred eighty-nine".