16551117 has 24 divisors (see below), whose sum is σ = 26926848. Its totient is φ = 9705600.

The previous prime is 16551091. The next prime is 16551131. The reversal of 16551117 is 71115561.

It is a happy number.

16551117 is a `hidden beast` number, since 1 + 655 + 1 + 1 + 1 + 7 = 666.

It is not a de Polignac number, because 16551117 - 2¹¹ = 16549069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16551917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 373 + ... + 5765.

It is an arithmetic number, because the mean of its divisors is an integer number (1121952).

Almost surely, 2^16551117 is an apocalyptic number.

It is an amenable number.

16551117 is a deficient number, since it is larger than the sum of its proper divisors (10375731).

16551117 is a wasteful number, since it uses less digits than its factorization.

16551117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5441 (or 5438 counting only the distinct ones).

The product of its digits is 1050, while the sum is 27.

The square root of 16551117 is about 4068.3064043899. The cubic root of 16551117 is about 254.8447959821.

Adding to 16551117 its reverse (71115561), we get a palindrome (87666678).

It can be divided in two parts, 1655 and 1117, that added together give a palindrome (2772).

The spelling of 16551117 in words is "sixteen million, five hundred fifty-one thousand, one hundred seventeen".