16554609 has 6 divisors (see below), whose sum is σ = 23912226. Its totient is φ = 11036400.

The previous prime is 16554581. The next prime is 16554619. The reversal of 16554609 is 90645561.

It can be written as a sum of positive squares in only one way, i.e., 16378209 + 176400 = 4047^2 + 420^2 .

It is not a de Polignac number, because 16554609 - 2⁸ = 16554353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16554619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 919692 + ... + 919709.

It is an arithmetic number, because the mean of its divisors is an integer number (3985371).

Almost surely, 2^16554609 is an apocalyptic number.

It is an amenable number.

16554609 is a deficient number, since it is larger than the sum of its proper divisors (7357617).

16554609 is a wasteful number, since it uses less digits than its factorization.

16554609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839407 (or 1839404 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 16554609 is about 4068.7355529697. The cubic root of 16554609 is about 254.8627173394.

The spelling of 16554609 in words is "sixteen million, five hundred fifty-four thousand, six hundred nine".