16312005 has 48 divisors (see below), whose sum is σ = 29628144. Its totient is φ = 8294400.

The previous prime is 16312003. The next prime is 16312019. The reversal of 16312005 is 50021361.

It can be written as a sum of positive squares in 8 ways, for example, as 2762244 + 13549761 = 1662^2 + 3681^2 .

It is not a de Polignac number, because 16312005 - 2¹ = 16312003 is a prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16312001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161455 + ... + 161555.

It is an arithmetic number, because the mean of its divisors is an integer number (617253).

Almost surely, 2^16312005 is an apocalyptic number.

16312005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16312005 is a deficient number, since it is larger than the sum of its proper divisors (13316139).

16312005 is a wasteful number, since it uses less digits than its factorization.

16312005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 16312005 is about 4038.8123254244. The cubic root of 16312005 is about 253.6116007806.

Adding to 16312005 its reverse (50021361), we get a palindrome (66333366).

The spelling of 16312005 in words is "sixteen million, three hundred twelve thousand, five".