16622891 has 4 divisors (see below), whose sum is σ = 17497800. Its totient is φ = 15747984.

The previous prime is 16622863. The next prime is 16622899. The reversal of 16622891 is 19822661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16622891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16622899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437426 + ... + 437463.

It is an arithmetic number, because the mean of its divisors is an integer number (4374450).

Almost surely, 2^16622891 is an apocalyptic number.

16622891 is a deficient number, since it is larger than the sum of its proper divisors (874909).

16622891 is an equidigital number, since it uses as much as digits as its factorization.

16622891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874908.

The product of its digits is 10368, while the sum is 35.

The square root of 16622891 is about 4077.1179771991. The cubic root of 16622891 is about 255.2126433384.

The spelling of 16622891 in words is "sixteen million, six hundred twenty-two thousand, eight hundred ninety-one".