16312231 has 16 divisors (see below), whose sum is σ = 19208448. Its totient is φ = 13708800.

The previous prime is 16312223. The next prime is 16312237. The reversal of 16312231 is 13221361.

It is not a de Polignac number, because 16312231 - 2³ = 16312223 is a prime.

It is a super-2 number, since 2×16312231² = 532177760394722, 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 = 16312199 and 16312208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16312237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5661 + ... + 8041.

It is an arithmetic number, because the mean of its divisors is an integer number (1200528).

Almost surely, 2^16312231 is an apocalyptic number.

16312231 is a deficient number, since it is larger than the sum of its proper divisors (2896217).

16312231 is a wasteful number, since it uses less digits than its factorization.

16312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442.

The product of its digits is 216, while the sum is 19.

The square root of 16312231 is about 4038.8403038496. The cubic root of 16312231 is about 253.6127720234.

Adding to 16312231 its reverse (13221361), we get a palindrome (29533592).

The spelling of 16312231 in words is "sixteen million, three hundred twelve thousand, two hundred thirty-one".