1085525509 has 4 divisors (see below), whose sum is σ = 1085617216. Its totient is φ = 1085433804.

The previous prime is 1085525501. The next prime is 1085525513. The reversal of 1085525509 is 9055255801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1085525509 - 2³ = 1085525501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1085525501) 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 in 3 ways as a sum of consecutive naturals, for example, 24909 + ... + 52834.

It is an arithmetic number, because the mean of its divisors is an integer number (271404304).

Almost surely, 2^1085525509 is an apocalyptic number.

It is an amenable number.

1085525509 is a deficient number, since it is larger than the sum of its proper divisors (91707).

1085525509 is an equidigital number, since it uses as much as digits as its factorization.

1085525509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91706.

The product of its (nonzero) digits is 90000, while the sum is 40.

The square root of 1085525509 is about 32947.3141393953. The cubic root of 1085525509 is about 1027.7323123836.

The spelling of 1085525509 in words is "one billion, eighty-five million, five hundred twenty-five thousand, five hundred nine".