16109231 has 4 divisors (see below), whose sum is σ = 16134264. Its totient is φ = 16084200.

The previous prime is 16109179. The next prime is 16109257. The reversal of 16109231 is 13290161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13290161 = 73 ⋅182057.

It is a cyclic number.

It is not a de Polignac number, because 16109231 - 2¹⁸ = 15847087 is a prime.

It is a super-2 number, since 2×16109231² = 519014646822722, 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 = 16109197 and 16109206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16129231) 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 3 ways as a sum of consecutive naturals, for example, 11525 + ... + 12846.

It is an arithmetic number, because the mean of its divisors is an integer number (4033566).

Almost surely, 2^16109231 is an apocalyptic number.

16109231 is a deficient number, since it is larger than the sum of its proper divisors (25033).

16109231 is an equidigital number, since it uses as much as digits as its factorization.

16109231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25032.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 16109231 is about 4013.6306506703. The cubic root of 16109231 is about 252.5563368069.

Adding to 16109231 its reverse (13290161), we get a palindrome (29399392).

The spelling of 16109231 in words is "sixteen million, one hundred nine thousand, two hundred thirty-one".