1144187917 has 2 divisors, whose sum is σ = 1144187918. Its totient is φ = 1144187916.

The previous prime is 1144187909. The next prime is 1144187921. The reversal of 1144187917 is 7197814411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 681679881 + 462508036 = 26109^2 + 21506^2 .

It is a cyclic number.

It is not a de Polignac number, because 1144187917 - 2³ = 1144187909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1144187977) 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, 572093958 + 572093959.

It is an arithmetic number, because the mean of its divisors is an integer number (572093959).

Almost surely, 2^1144187917 is an apocalyptic number.

It is an amenable number.

1144187917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1144187917 is an equidigital number, since it uses as much as digits as its factorization.

1144187917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 43.

The square root of 1144187917 is about 33825.8468777945. The cubic root of 1144187917 is about 1045.9215688578.

The spelling of 1144187917 in words is "one billion, one hundred forty-four million, one hundred eighty-seven thousand, nine hundred seventeen".