16523231 has 4 divisors (see below), whose sum is σ = 16533912. Its totient is φ = 16512552.

The previous prime is 16523207. The next prime is 16523237. The reversal of 16523231 is 13232561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16523231 - 2¹⁸ = 16261087 is a prime.

It is a super-3 number, since 3×16523231³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16523197 and 16523206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16523237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2525 + ... + 6278.

It is an arithmetic number, because the mean of its divisors is an integer number (4133478).

Almost surely, 2^16523231 is an apocalyptic number.

16523231 is a deficient number, since it is larger than the sum of its proper divisors (10681).

16523231 is an equidigital number, since it uses as much as digits as its factorization.

16523231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10680.

The product of its digits is 1080, while the sum is 23.

The square root of 16523231 is about 4064.8777349387. The cubic root of 16523231 is about 254.7015912085.

Adding to 16523231 its reverse (13232561), we get a palindrome (29755792).

The spelling of 16523231 in words is "sixteen million, five hundred twenty-three thousand, two hundred thirty-one".