16281661 has 8 divisors (see below), whose sum is σ = 17863200. Its totient is φ = 14717040.

The previous prime is 16281647. The next prime is 16281679. The reversal of 16281661 is 16618261.

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 16281661 - 2⁷ = 16281533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16281611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2166 + ... + 6103.

It is an arithmetic number, because the mean of its divisors is an integer number (2232900).

Almost surely, 2^16281661 is an apocalyptic number.

16281661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16281661 is a deficient number, since it is larger than the sum of its proper divisors (1581539).

16281661 is a wasteful number, since it uses less digits than its factorization.

16281661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8459.

The product of its digits is 3456, while the sum is 31.

The square root of 16281661 is about 4035.0540268998. The cubic root of 16281661 is about 253.4542449518.

The spelling of 16281661 in words is "sixteen million, two hundred eighty-one thousand, six hundred sixty-one".