31813844831813 has 6 divisors (see below), whose sum is σ = 34968936881382. Its totient is φ = 28921677119720.

The previous prime is 31813844831723. The next prime is 31813844831819.

31813844831813 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 28092194242849 + 3721650588964 = 5300207^2 + 1929158^2 .

It is not a de Polignac number, because 31813844831813 - 2²⁴ = 31813828054597 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 (31813844831819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 131462168606 + ... + 131462168847.

It is an arithmetic number, because the mean of its divisors is an integer number (5828156146897).

Almost surely, 2^{31813844831813} is an apocalyptic number.

It is an amenable number.

31813844831813 is a deficient number, since it is larger than the sum of its proper divisors (3155092049569).

31813844831813 is a wasteful number, since it uses less digits than its factorization.

31813844831813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262924337475 (or 262924337464 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 56.

The spelling of 31813844831813 in words is "thirty-one trillion, eight hundred thirteen billion, eight hundred forty-four million, eight hundred thirty-one thousand, eight hundred thirteen".