1118987117 has 4 divisors (see below), whose sum is σ = 1119076476. Its totient is φ = 1118897760.

The previous prime is 1118987101. The next prime is 1118987119. The reversal of 1118987117 is 7117898111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7117898111 = 41 ⋅173607271.

It can be written as a sum of positive squares in 2 ways, for example, as 941937481 + 177049636 = 30691^2 + 13306^2 .

It is a cyclic number.

It is not a de Polignac number, because 1118987117 - 2⁴ = 1118987101 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 (1118987119) 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, 22088 + ... + 52209.

It is an arithmetic number, because the mean of its divisors is an integer number (279769119).

Almost surely, 2^1118987117 is an apocalyptic number.

It is an amenable number.

1118987117 is a deficient number, since it is larger than the sum of its proper divisors (89359).

1118987117 is an equidigital number, since it uses as much as digits as its factorization.

1118987117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89358.

The product of its digits is 28224, while the sum is 44.

The square root of 1118987117 is about 33451.2648041894. The cubic root of 1118987117 is about 1038.1856670809.

The spelling of 1118987117 in words is "one billion, one hundred eighteen million, nine hundred eighty-seven thousand, one hundred seventeen".