1109817917687 has 4 divisors (see below), whose sum is σ = 1111549303536. Its totient is φ = 1108086531840.

The previous prime is 1109817917641. The next prime is 1109817917743. The reversal of 1109817917687 is 7867197189011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1109817917687 - 2¹⁶ = 1109817852151 is a prime.

It is a super-3 number, since 3×1109817917687³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109817916687) 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, 865691963 + ... + 865693244.

It is an arithmetic number, because the mean of its divisors is an integer number (277887325884).

Almost surely, 2^{1109817917687} is an apocalyptic number.

1109817917687 is a deficient number, since it is larger than the sum of its proper divisors (1731385849).

1109817917687 is an equidigital number, since it uses as much as digits as its factorization.

1109817917687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731385848.

The product of its (nonzero) digits is 10668672, while the sum is 65.

The spelling of 1109817917687 in words is "one trillion, one hundred nine billion, eight hundred seventeen million, nine hundred seventeen thousand, six hundred eighty-seven".