981088909 has 2 divisors, whose sum is σ = 981088910. Its totient is φ = 981088908.

The previous prime is 981088873. The next prime is 981088931. The reversal of 981088909 is 909880189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 980629225 + 459684 = 31315^2 + 678^2 .

It is a cyclic number.

It is not a de Polignac number, because 981088909 - 2⁹ = 981088397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981088949) 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, 490544454 + 490544455.

It is an arithmetic number, because the mean of its divisors is an integer number (490544455).

Almost surely, 2^981088909 is an apocalyptic number.

It is an amenable number.

981088909 is a deficient number, since it is larger than the sum of its proper divisors (1).

981088909 is an equidigital number, since it uses as much as digits as its factorization.

981088909 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 52.

The square root of 981088909 is about 31322.3388175277. The cubic root of 981088909 is about 993.6561435876.

The spelling of 981088909 in words is "nine hundred eighty-one million, eighty-eight thousand, nine hundred nine".