1098989 has 2 divisors, whose sum is σ = 1098990. Its totient is φ = 1098988.

The previous prime is 1098973. The next prime is 1099031. The reversal of 1098989 is 9898901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1085764 + 13225 = 1042^2 + 115^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098989 - 2⁴ = 1098973 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1098689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549494 + 549495.

It is an arithmetic number, because the mean of its divisors is an integer number (549495).

2^1098989 is an apocalyptic number.

It is an amenable number.

1098989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098989 is an equidigital number, since it uses as much as digits as its factorization.

1098989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 1098989 is about 1048.3267620356. The cubic root of 1098989 is about 103.1963765429.

The spelling of 1098989 in words is "one million, ninety-eight thousand, nine hundred eighty-nine".