16491871 has 8 divisors (see below), whose sum is σ = 18068688. Its totient is φ = 14928000.

The previous prime is 16491859. The next prime is 16491883. The reversal of 16491871 is 17819461.

It is an interprime number because it is at equal distance from previous prime (16491859) and next prime (16491883).

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 16491871 - 2⁷ = 16491743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16491871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16491821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460 + ... + 5761.

It is an arithmetic number, because the mean of its divisors is an integer number (2258586).

Almost surely, 2^16491871 is an apocalyptic number.

16491871 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16491871 is a deficient number, since it is larger than the sum of its proper divisors (1576817).

16491871 is a wasteful number, since it uses less digits than its factorization.

16491871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6473.

The product of its digits is 12096, while the sum is 37.

The square root of 16491871 is about 4061.0184683156. The cubic root of 16491871 is about 254.5403535658.

The spelling of 16491871 in words is "sixteen million, four hundred ninety-one thousand, eight hundred seventy-one".