16562161 has 16 divisors (see below), whose sum is σ = 21363840. Its totient is φ = 12458880.

The previous prime is 16562141. The next prime is 16562177. The reversal of 16562161 is 16126561.

It is not a de Polignac number, because 16562161 - 2¹⁵ = 16529393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16562101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1476 + ... + 5941.

It is an arithmetic number, because the mean of its divisors is an integer number (1335240).

Almost surely, 2^16562161 is an apocalyptic number.

16562161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16562161 is a deficient number, since it is larger than the sum of its proper divisors (4801679).

16562161 is a wasteful number, since it uses less digits than its factorization.

16562161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7464.

The product of its digits is 2160, while the sum is 28.

The square root of 16562161 is about 4069.6634996029. The cubic root of 16562161 is about 254.9014664805.

Subtracting from 16562161 its reverse (16126561), we obtain a square (435600 = 660²).

It can be divided in two parts, 165 and 62161, that added together give a palindrome (62326).

The spelling of 16562161 in words is "sixteen million, five hundred sixty-two thousand, one hundred sixty-one".