16642291 has 4 divisors (see below), whose sum is σ = 16670584. Its totient is φ = 16614000.

The previous prime is 16642253. The next prime is 16642313. The reversal of 16642291 is 19224661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16642291 - 2¹¹ = 16640243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16642211) 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 3 ways as a sum of consecutive naturals, for example, 13245 + ... + 14446.

It is an arithmetic number, because the mean of its divisors is an integer number (4167646).

Almost surely, 2^16642291 is an apocalyptic number.

16642291 is a deficient number, since it is larger than the sum of its proper divisors (28293).

16642291 is an equidigital number, since it uses as much as digits as its factorization.

16642291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28292.

The product of its digits is 5184, while the sum is 31.

The square root of 16642291 is about 4079.4964150003. The cubic root of 16642291 is about 255.3118880172.

The spelling of 16642291 in words is "sixteen million, six hundred forty-two thousand, two hundred ninety-one".