1098187609 has 2 divisors, whose sum is σ = 1098187610. Its totient is φ = 1098187608.

The previous prime is 1098187549. The next prime is 1098187619. The reversal of 1098187609 is 9067818901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1073217600 + 24970009 = 32760^2 + 4997^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098187609 - 2²³ = 1089799001 is a prime.

It is a super-2 number, since 2×1098187609² = 2412032049122273762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1098187619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549093804 + 549093805.

It is an arithmetic number, because the mean of its divisors is an integer number (549093805).

Almost surely, 2^1098187609 is an apocalyptic number.

It is an amenable number.

1098187609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098187609 is an equidigital number, since it uses as much as digits as its factorization.

1098187609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 49.

The square root of 1098187609 is about 33138.9138174443. The cubic root of 1098187609 is about 1031.7128658668.

The spelling of 1098187609 in words is "one billion, ninety-eight million, one hundred eighty-seven thousand, six hundred nine".