16991117 has 8 divisors (see below), whose sum is σ = 19961760. Its totient is φ = 14258160.

The previous prime is 16991101. The next prime is 16991119. The reversal of 16991117 is 71119961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16991117 - 2⁴ = 16991101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16991119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59267 + ... + 59552.

It is an arithmetic number, because the mean of its divisors is an integer number (2495220).

Almost surely, 2^16991117 is an apocalyptic number.

It is an amenable number.

16991117 is a deficient number, since it is larger than the sum of its proper divisors (2970643).

16991117 is a wasteful number, since it uses less digits than its factorization.

16991117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118843.

The product of its digits is 3402, while the sum is 35.

The square root of 16991117 is about 4122.0282628822. The cubic root of 16991117 is about 257.0833655877.

The spelling of 16991117 in words is "sixteen million, nine hundred ninety-one thousand, one hundred seventeen".