16600991 has 8 divisors (see below), whose sum is σ = 18144000. Its totient is φ = 15063640.

The previous prime is 16600951. The next prime is 16601029. The reversal of 16600991 is 19900661.

It is a happy number.

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 16600991 - 2²² = 12406687 is a prime.

16600991 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16600931) 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, 6860 + ... + 8958.

It is an arithmetic number, because the mean of its divisors is an integer number (2268000).

Almost surely, 2^16600991 is an apocalyptic number.

16600991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16600991 is a deficient number, since it is larger than the sum of its proper divisors (1543009).

16600991 is a wasteful number, since it uses less digits than its factorization.

16600991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 16600991 is about 4074.4313713695. The cubic root of 16600991 is about 255.1005165692.

The spelling of 16600991 in words is "sixteen million, six hundred thousand, nine hundred ninety-one".