1098236509 has 4 divisors (see below), whose sum is σ = 1105231804. Its totient is φ = 1091241216.

The previous prime is 1098236501. The next prime is 1098236527. The reversal of 1098236509 is 9056328901.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9056328901 = 82633 ⋅109597.

It can be written as a sum of positive squares in 2 ways, for example, as 361114009 + 737122500 = 19003^2 + 27150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098236509 - 2³ = 1098236501 is a prime.

It is a super-2 number, since 2×1098236509² = 2412246859401014162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098236501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3497412 + ... + 3497725.

It is an arithmetic number, because the mean of its divisors is an integer number (276307951).

Almost surely, 2^1098236509 is an apocalyptic number.

It is an amenable number.

1098236509 is a deficient number, since it is larger than the sum of its proper divisors (6995295).

1098236509 is an equidigital number, since it uses as much as digits as its factorization.

1098236509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6995294.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 1098236509 is about 33139.6516125321. The cubic root of 1098236509 is about 1031.7281789791.

The spelling of 1098236509 in words is "one billion, ninety-eight million, two hundred thirty-six thousand, five hundred nine".