1098689 has 2 divisors, whose sum is σ = 1098690. Its totient is φ = 1098688.

The previous prime is 1098673. The next prime is 1098707. The reversal of 1098689 is 9868901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 748225 + 350464 = 865^2 + 592^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098689 - 2⁴ = 1098673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1098649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549344 + 549345.

It is an arithmetic number, because the mean of its divisors is an integer number (549345).

2^1098689 is an apocalyptic number.

It is an amenable number.

1098689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098689 is an equidigital number, since it uses as much as digits as its factorization.

1098689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1098689 is about 1048.1836671118. The cubic root of 1098689 is about 103.1869855691.

The spelling of 1098689 in words is "one million, ninety-eight thousand, six hundred eighty-nine".