16991100 has 288 divisors, whose sum is σ = 66662400. Its totient is φ = 3628800.

The previous prime is 16991099. The next prime is 16991101. The reversal of 16991100 is 119961.

It is an interprime number because it is at equal distance from previous prime (16991099) and next prime (16991101).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16991101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 548085 + ... + 548115.

Almost surely, 2^16991100 is an apocalyptic number.

16991100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16991100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33331200).

16991100 is an abundant number, since it is smaller than the sum of its proper divisors (49671300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16991100 is a wasteful number, since it uses less digits than its factorization.

16991100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 16991100 is about 4122.0262007901. The cubic root of 16991100 is about 257.0832798484.

The spelling of 16991100 in words is "sixteen million, nine hundred ninety-one thousand, one hundred".