1118528409 has 4 divisors (see below), whose sum is σ = 1491371216. Its totient is φ = 745685604.

The previous prime is 1118528407. The next prime is 1118528441. The reversal of 1118528409 is 9048258111.

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.

It is not a de Polignac number, because 1118528409 - 2¹ = 1118528407 is a prime.

It is a super-2 number, since 2×1118528409² = 2502211603480142562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1118528401) 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, 186421399 + ... + 186421404.

It is an arithmetic number, because the mean of its divisors is an integer number (372842804).

Almost surely, 2^1118528409 is an apocalyptic number.

It is an amenable number.

1118528409 is a deficient number, since it is larger than the sum of its proper divisors (372842807).

1118528409 is an equidigital number, since it uses as much as digits as its factorization.

1118528409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372842806.

The product of its (nonzero) digits is 23040, while the sum is 39.

The square root of 1118528409 is about 33444.4077388134. The cubic root of 1118528409 is about 1038.0437860435.

The spelling of 1118528409 in words is "one billion, one hundred eighteen million, five hundred twenty-eight thousand, four hundred nine".