1089398813 has 2 divisors, whose sum is σ = 1089398814. Its totient is φ = 1089398812.

The previous prime is 1089398809. The next prime is 1089398837. The reversal of 1089398813 is 3188939801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 855094564 + 234304249 = 29242^2 + 15307^2 .

It is a cyclic number.

It is not a de Polignac number, because 1089398813 - 2² = 1089398809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1089398873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544699406 + 544699407.

It is an arithmetic number, because the mean of its divisors is an integer number (544699407).

Almost surely, 2^1089398813 is an apocalyptic number.

It is an amenable number.

1089398813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1089398813 is an equidigital number, since it uses as much as digits as its factorization.

1089398813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 1089398813 is about 33006.0420680820. The cubic root of 1089398813 is about 1028.9532247196.

The spelling of 1089398813 in words is "one billion, eighty-nine million, three hundred ninety-eight thousand, eight hundred thirteen".