16551424 has 20 divisors (see below), whose sum is σ = 33071544. Its totient is φ = 8275456.

The previous prime is 16551391. The next prime is 16551439. The reversal of 16551424 is 42415561.

It is a junction number, because it is equal to n+sod(n) for n = 16551392 and 16551401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15652 + ... + 16675.

Almost surely, 2^16551424 is an apocalyptic number.

It is an amenable number.

16551424 is a deficient number, since it is larger than the sum of its proper divisors (16520120).

16551424 is an frugal number, since it uses more digits than its factorization.

16551424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32345 (or 32329 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 16551424 is about 4068.3441349030. The cubic root of 16551424 is about 254.8463716435.

Adding to 16551424 its reverse (42415561), we get a palindrome (58966985).

The spelling of 16551424 in words is "sixteen million, five hundred fifty-one thousand, four hundred twenty-four".