31316813 has 8 divisors (see below), whose sum is σ = 34576416. Its totient is φ = 28126000.

The previous prime is 31316809. The next prime is 31316819. The reversal of 31316813 is 31861313.

It is a happy number.

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 31316813 - 2² = 31316809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31316819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16238 + ... + 18063.

It is an arithmetic number, because the mean of its divisors is an integer number (4322052).

Almost surely, 2^31316813 is an apocalyptic number.

It is an amenable number.

31316813 is a deficient number, since it is larger than the sum of its proper divisors (3259603).

31316813 is a wasteful number, since it uses less digits than its factorization.

31316813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34395.

The product of its digits is 1296, while the sum is 26.

The square root of 31316813 is about 5596.1426893888. The cubic root of 31316813 is about 315.2045802982.

The spelling of 31316813 in words is "thirty-one million, three hundred sixteen thousand, eight hundred thirteen".