1098153985 has 4 divisors (see below), whose sum is σ = 1317784788. Its totient is φ = 878523184.

The previous prime is 1098153971. The next prime is 1098154009. The reversal of 1098153985 is 5893518901.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 612216049 + 485937936 = 24743^2 + 22044^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098153985 - 2¹¹ = 1098151937 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109815394 + ... + 109815403.

It is an arithmetic number, because the mean of its divisors is an integer number (329446197).

Almost surely, 2^1098153985 is an apocalyptic number.

It is an amenable number.

1098153985 is a deficient number, since it is larger than the sum of its proper divisors (219630803).

1098153985 is an equidigital number, since it uses as much as digits as its factorization.

1098153985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219630802.

The product of its (nonzero) digits is 388800, while the sum is 49.

The square root of 1098153985 is about 33138.4064945797. The cubic root of 1098153985 is about 1031.7023361944.

The spelling of 1098153985 in words is "one billion, ninety-eight million, one hundred fifty-three thousand, nine hundred eighty-five".