16417621 has 4 divisors (see below), whose sum is σ = 17910144. Its totient is φ = 14925100.

The previous prime is 16417591. The next prime is 16417637. The reversal of 16417621 is 12671461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16417621 - 2¹³ = 16409429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16417621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16417721) 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 3 ways as a sum of consecutive naturals, for example, 746245 + ... + 746266.

It is an arithmetic number, because the mean of its divisors is an integer number (4477536).

Almost surely, 2^16417621 is an apocalyptic number.

16417621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16417621 is a deficient number, since it is larger than the sum of its proper divisors (1492523).

16417621 is a wasteful number, since it uses less digits than its factorization.

16417621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492522.

The product of its digits is 2016, while the sum is 28.

The square root of 16417621 is about 4051.8663600864. The cubic root of 16417621 is about 254.1577801187.

The spelling of 16417621 in words is "sixteen million, four hundred seventeen thousand, six hundred twenty-one".