1115559999 has 32 divisors (see below), whose sum is σ = 1673379840. Its totient is φ = 734450976.

The previous prime is 1115559997. The next prime is 1115560001. The reversal of 1115559999 is 9999555111.

It is a Cunningham number, because it is equal to 33400²-1.

It is an interprime number because it is at equal distance from previous prime (1115559997) and next prime (1115560001).

It is not a de Polignac number, because 1115559999 - 2¹ = 1115559997 is a prime.

It is a super-2 number, since 2×1115559999² = 2488948222737760002, which contains 22 as substring.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115559997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 901209 + ... + 902445.

It is an arithmetic number, because the mean of its divisors is an integer number (52293120).

Almost surely, 2^1115559999 is an apocalyptic number.

1115559999 is a deficient number, since it is larger than the sum of its proper divisors (557819841).

1115559999 is a wasteful number, since it uses less digits than its factorization.

1115559999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636 (or 1630 counting only the distinct ones).

The product of its digits is 820125, while the sum is 54.

The square root of 1115559999 is about 33399.9999850299. Note that the first 4 decimals coincide. The cubic root of 1115559999 is about 1037.1247006442.

The spelling of 1115559999 in words is "one billion, one hundred fifteen million, five hundred fifty-nine thousand, nine hundred ninety-nine".