3131621313213 has 4 divisors (see below), whose sum is σ = 4175495084288. Its totient is φ = 2087747542140.

The previous prime is 3131621313203. The next prime is 3131621313287. The reversal of 3131621313213 is 3123131261313.

It is a happy number.

3131621313213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3131621313213 - 2⁵ = 3131621313181 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 (3131621313203) 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, 521936885533 + ... + 521936885538.

It is an arithmetic number, because the mean of its divisors is an integer number (1043873771072).

Almost surely, 2^{3131621313213} is an apocalyptic number.

It is an amenable number.

3131621313213 is a deficient number, since it is larger than the sum of its proper divisors (1043873771075).

3131621313213 is a wasteful number, since it uses less digits than its factorization.

3131621313213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043873771074.

The product of its digits is 5832, while the sum is 30.

Adding to 3131621313213 its reverse (3123131261313), we get a palindrome (6254752574526).

The spelling of 3131621313213 in words is "three trillion, one hundred thirty-one billion, six hundred twenty-one million, three hundred thirteen thousand, two hundred thirteen".