31313005 has 8 divisors (see below), whose sum is σ = 39209472. Its totient is φ = 23961168.

The previous prime is 31312999. The next prime is 31313017. The reversal of 31313005 is 50031313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31313005 - 2⁵ = 31312973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31313005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136029 + ... + 136258.

It is an arithmetic number, because the mean of its divisors is an integer number (4901184).

Almost surely, 2^31313005 is an apocalyptic number.

It is an amenable number.

31313005 is a deficient number, since it is larger than the sum of its proper divisors (7896467).

31313005 is a wasteful number, since it uses less digits than its factorization.

31313005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272315.

The product of its (nonzero) digits is 135, while the sum is 16.

The square root of 31313005 is about 5595.8024446901. The cubic root of 31313005 is about 315.1918039056.

Adding to 31313005 its reverse (50031313), we get a palindrome (81344318).

The spelling of 31313005 in words is "thirty-one million, three hundred thirteen thousand, five".