1211149969 has 2 divisors, whose sum is σ = 1211149970. Its totient is φ = 1211149968.

The previous prime is 1211149957. The next prime is 1211149981. The reversal of 1211149969 is 9699411121.

It is a balanced prime because it is at equal distance from previous prime (1211149957) and next prime (1211149981).

It can be written as a sum of positive squares in only one way, i.e., 903603600 + 307546369 = 30060^2 + 17537^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211149969 - 2¹¹ = 1211147921 is a prime.

It is a super-2 number, since 2×1211149969² = 2933768494817401922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211149949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605574984 + 605574985.

It is an arithmetic number, because the mean of its divisors is an integer number (605574985).

Almost surely, 2^1211149969 is an apocalyptic number.

It is an amenable number.

1211149969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211149969 is an equidigital number, since it uses as much as digits as its factorization.

1211149969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 43.

The square root of 1211149969 is about 34801.5799785010. The cubic root of 1211149969 is about 1065.9397082649.

The spelling of 1211149969 in words is "one billion, two hundred eleven million, one hundred forty-nine thousand, nine hundred sixty-nine".