16516231 has 16 divisors (see below), whose sum is σ = 18615744. Its totient is φ = 14569984.

The previous prime is 16516219. The next prime is 16516249. The reversal of 16516231 is 13261561.

It is a cyclic number.

It is not a de Polignac number, because 16516231 - 2¹³ = 16508039 is a prime.

It is a super-2 number, since 2×16516231² = 545571772890722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16516196 and 16516205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16516271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20325 + ... + 21121.

It is an arithmetic number, because the mean of its divisors is an integer number (1163484).

Almost surely, 2^16516231 is an apocalyptic number.

16516231 is a deficient number, since it is larger than the sum of its proper divisors (2099513).

16516231 is a wasteful number, since it uses less digits than its factorization.

16516231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890.

The product of its digits is 1080, while the sum is 25.

The square root of 16516231 is about 4064.0166092180. The cubic root of 16516231 is about 254.6656183617.

Adding to 16516231 its reverse (13261561), we get a palindrome (29777792).

The spelling of 16516231 in words is "sixteen million, five hundred sixteen thousand, two hundred thirty-one".