1018091489 has 2 divisors, whose sum is σ = 1018091490. Its totient is φ = 1018091488.

The previous prime is 1018091471. The next prime is 1018091531. The reversal of 1018091489 is 9841908101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664350625 + 353740864 = 25775^2 + 18808^2 .

It is an emirp because it is prime and its reverse (9841908101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1018091489 - 2⁸ = 1018091233 is a prime.

It is a super-3 number, since 3×1018091489³ (a number of 28 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1018091089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509045744 + 509045745.

It is an arithmetic number, because the mean of its divisors is an integer number (509045745).

Almost surely, 2^1018091489 is an apocalyptic number.

It is an amenable number.

1018091489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1018091489 is an equidigital number, since it uses as much as digits as its factorization.

1018091489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 41.

The square root of 1018091489 is about 31907.5459570303. The cubic root of 1018091489 is about 1005.9944906138.

The spelling of 1018091489 in words is "one billion, eighteen million, ninety-one thousand, four hundred eighty-nine".