1115623209 has 16 divisors (see below), whose sum is σ = 1570153280. Its totient is φ = 704591136.

The previous prime is 1115623207. The next prime is 1115623273. The reversal of 1115623209 is 9023265111.

It is not a de Polignac number, because 1115623209 - 2¹ = 1115623207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1115623207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6532 + ... + 47685.

It is an arithmetic number, because the mean of its divisors is an integer number (98134580).

Almost surely, 2^1115623209 is an apocalyptic number.

1115623209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1115623209 is a deficient number, since it is larger than the sum of its proper divisors (454530071).

1115623209 is an frugal number, since it uses more digits than its factorization.

1115623209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54277 (or 54239 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1115623209 is about 33400.9462291115. The cubic root of 1115623209 is about 1037.1442888374.

The spelling of 1115623209 in words is "one billion, one hundred fifteen million, six hundred twenty-three thousand, two hundred nine".