31033311213 has 4 divisors (see below), whose sum is σ = 41377748288. Its totient is φ = 20688874140.

The previous prime is 31033311163. The next prime is 31033311229. The reversal of 31033311213 is 31211333013.

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 a de Polignac number, because none of the positive numbers 2^k-31033311213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31033311213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31033311263) 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, 5172218533 + ... + 5172218538.

It is an arithmetic number, because the mean of its divisors is an integer number (10344437072).

Almost surely, 2^31033311213 is an apocalyptic number.

It is an amenable number.

31033311213 is a deficient number, since it is larger than the sum of its proper divisors (10344437075).

31033311213 is a wasteful number, since it uses less digits than its factorization.

31033311213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10344437074.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 31033311213 its reverse (31211333013), we get a palindrome (62244644226).

The spelling of 31033311213 in words is "thirty-one billion, thirty-three million, three hundred eleven thousand, two hundred thirteen".