1085598553 has 4 divisors (see below), whose sum is σ = 1169106148. Its totient is φ = 1002090960.

The previous prime is 1085598541. The next prime is 1085598581. The reversal of 1085598553 is 3558955801.

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: 3558955801 = 1061 ⋅3354341.

It can be written as a sum of positive squares in 2 ways, for example, as 184878409 + 900720144 = 13597^2 + 30012^2 .

It is not a de Polignac number, because 1085598553 - 2²⁵ = 1052044121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1085598497 and 1085598506.

It is not an unprimeable number, because it can be changed into a prime (1085598853) 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, 41753778 + ... + 41753803.

It is an arithmetic number, because the mean of its divisors is an integer number (292276537).

Almost surely, 2^1085598553 is an apocalyptic number.

1085598553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1085598553 is a deficient number, since it is larger than the sum of its proper divisors (83507595).

1085598553 is an equidigital number, since it uses as much as digits as its factorization.

1085598553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83507594.

The product of its (nonzero) digits is 1080000, while the sum is 49.

The square root of 1085598553 is about 32948.4226177825. The cubic root of 1085598553 is about 1027.7553635831.

The spelling of 1085598553 in words is "one billion, eighty-five million, five hundred ninety-eight thousand, five hundred fifty-three".