1144778989 has 2 divisors, whose sum is σ = 1144778990. Its totient is φ = 1144778988.

The previous prime is 1144778969. The next prime is 1144779011. The reversal of 1144778989 is 9898774411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1066544964 + 78234025 = 32658^2 + 8845^2 .

It is an emirp because it is prime and its reverse (9898774411) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1144778989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1144778969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572389494 + 572389495.

It is an arithmetic number, because the mean of its divisors is an integer number (572389495).

Almost surely, 2^1144778989 is an apocalyptic number.

It is an amenable number.

1144778989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1144778989 is an equidigital number, since it uses as much as digits as its factorization.

1144778989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 58.

The square root of 1144778989 is about 33834.5827371936. The cubic root of 1144778989 is about 1046.1016408317.

The spelling of 1144778989 in words is "one billion, one hundred forty-four million, seven hundred seventy-eight thousand, nine hundred eighty-nine".