117991903 has 4 divisors (see below), whose sum is σ = 118043920. Its totient is φ = 117939888.

The previous prime is 117991897. The next prime is 117991931. The reversal of 117991903 is 309199711.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117991903 is a prime.

It is a super-2 number, since 2×117991903² = 27844178347122818, which contains 22 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 (117991933) 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, 22443 + ... + 27196.

It is an arithmetic number, because the mean of its divisors is an integer number (29510980).

Almost surely, 2^117991903 is an apocalyptic number.

117991903 is a deficient number, since it is larger than the sum of its proper divisors (52017).

117991903 is an equidigital number, since it uses as much as digits as its factorization.

117991903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52016.

The product of its (nonzero) digits is 15309, while the sum is 40.

The square root of 117991903 is about 10862.4077901725. The cubic root of 117991903 is about 490.4755940491.

The spelling of 117991903 in words is "one hundred seventeen million, nine hundred ninety-one thousand, nine hundred three".