16406551 has 4 divisors (see below), whose sum is σ = 18750352. Its totient is φ = 14062752.

The previous prime is 16406501. The next prime is 16406563. The reversal of 16406551 is 15560461.

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 16406551 - 2¹¹ = 16404503 is a prime.

It is the 4051-st Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16406501) by changing a digit.

It is a nontrivial repunit in base 4050.

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, 1171890 + ... + 1171903.

It is an arithmetic number, because the mean of its divisors is an integer number (4687588).

Almost surely, 2^16406551 is an apocalyptic number.

16406551 is a deficient number, since it is larger than the sum of its proper divisors (2343801).

16406551 is an equidigital number, since it uses as much as digits as its factorization.

16406551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2343800.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 16406551 is about 4050.5000925812. The cubic root of 16406551 is about 254.1006431513.

The spelling of 16406551 in words is "sixteen million, four hundred six thousand, five hundred fifty-one".