31321031011313 has 4 divisors (see below), whose sum is σ = 31321342018548. Its totient is φ = 31320720004080.

The previous prime is 31321031011307. The next prime is 31321031011321. The reversal of 31321031011313 is 31311013012313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25551124355344 + 5769906655969 = 5054812^2 + 2402063^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321031011313 - 2⁴ = 31321031011297 is a prime.

It is a super-2 number, since 2×31321031011313² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31321031013313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155352506 + ... + 155553987.

It is an arithmetic number, because the mean of its divisors is an integer number (7830335504637).

Almost surely, 2^{31321031011313} is an apocalyptic number.

It is an amenable number.

31321031011313 is a deficient number, since it is larger than the sum of its proper divisors (311007235).

31321031011313 is a wasteful number, since it uses less digits than its factorization.

31321031011313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311007234.

The product of its (nonzero) digits is 486, while the sum is 23.

Adding to 31321031011313 its reverse (31311013012313), we get a palindrome (62632044023626).

The spelling of 31321031011313 in words is "thirty-one trillion, three hundred twenty-one billion, thirty-one million, eleven thousand, three hundred thirteen".