31318005 has 16 divisors (see below), whose sum is σ = 50420160. Its totient is φ = 16599168.

The previous prime is 31318003. The next prime is 31318013. The reversal of 31318005 is 50081313.

It is a happy number.

It is not a de Polignac number, because 31318005 - 2¹ = 31318003 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31318003) 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, 3960 + ... + 8849.

It is an arithmetic number, because the mean of its divisors is an integer number (3151260).

Almost surely, 2^31318005 is an apocalyptic number.

It is an amenable number.

31318005 is a deficient number, since it is larger than the sum of its proper divisors (19102155).

31318005 is a wasteful number, since it uses less digits than its factorization.

31318005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12980.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 31318005 is about 5596.2491903059. The cubic root of 31318005 is about 315.2085794183.

Adding to 31318005 its reverse (50081313), we get a palindrome (81399318).

The spelling of 31318005 in words is "thirty-one million, three hundred eighteen thousand, five".