31311313 has 8 divisors (see below), whose sum is σ = 34497216. Its totient is φ = 28182000.

The previous prime is 31311281. The next prime is 31311323.

31311313 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 31311313 - 2⁵ = 31311281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12981 + ... + 15202.

It is an arithmetic number, because the mean of its divisors is an integer number (4312152).

Almost surely, 2^31311313 is an apocalyptic number.

It is an amenable number.

31311313 is a deficient number, since it is larger than the sum of its proper divisors (3185903).

31311313 is a wasteful number, since it uses less digits than its factorization.

31311313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28295.

The product of its digits is 81, while the sum is 16.

The square root of 31311313 is about 5595.6512578966. The cubic root of 31311313 is about 315.1861266676.

It can be divided in two parts, 3131 and 1313, that added together give a palindrome (4444).

The spelling of 31311313 in words is "thirty-one million, three hundred eleven thousand, three hundred thirteen".