1211149993 has 2 divisors, whose sum is σ = 1211149994. Its totient is φ = 1211149992.

The previous prime is 1211149987. The next prime is 1211150009. The reversal of 1211149993 is 3999411121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 907937424 + 303212569 = 30132^2 + 17413^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211149993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211149913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605574996 + 605574997.

It is an arithmetic number, because the mean of its divisors is an integer number (605574997).

Almost surely, 2^1211149993 is an apocalyptic number.

It is an amenable number.

1211149993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211149993 is an equidigital number, since it uses as much as digits as its factorization.

1211149993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 40.

The square root of 1211149993 is about 34801.5803233129. The cubic root of 1211149993 is about 1065.9397153057.

The spelling of 1211149993 in words is "one billion, two hundred eleven million, one hundred forty-nine thousand, nine hundred ninety-three".