1149640909 has 2 divisors, whose sum is σ = 1149640910. Its totient is φ = 1149640908.

The previous prime is 1149640903. The next prime is 1149640951. The reversal of 1149640909 is 9090469411.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1148532100 + 1108809 = 33890^2 + 1053^2 .

It is a cyclic number.

It is not a de Polignac number, because 1149640909 - 2⁷ = 1149640781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1149640903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 574820454 + 574820455.

It is an arithmetic number, because the mean of its divisors is an integer number (574820455).

Almost surely, 2^1149640909 is an apocalyptic number.

It is an amenable number.

1149640909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1149640909 is an equidigital number, since it uses as much as digits as its factorization.

1149640909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 1149640909 is about 33906.3549943075. The cubic root of 1149640909 is about 1047.5804937356.

The spelling of 1149640909 in words is "one billion, one hundred forty-nine million, six hundred forty thousand, nine hundred nine".