31316005 has 32 divisors (see below), whose sum is σ = 44593920. Its totient is φ = 20666880.

The previous prime is 31316003. The next prime is 31316039. The reversal of 31316005 is 50061313.

It is not a de Polignac number, because 31316005 - 2¹ = 31316003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31316003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 199387 + ... + 199543.

It is an arithmetic number, because the mean of its divisors is an integer number (1393560).

Almost surely, 2^31316005 is an apocalyptic number.

31316005 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31316005 is a deficient number, since it is larger than the sum of its proper divisors (13277915).

31316005 is a wasteful number, since it uses less digits than its factorization.

31316005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 31316005 is about 5596.0704963394. The cubic root of 31316005 is about 315.2018694275.

Adding to 31316005 its reverse (50061313), we get a palindrome (81377318).

The spelling of 31316005 in words is "thirty-one million, three hundred sixteen thousand, five".