31311332213 has 4 divisors (see below), whose sum is σ = 35784379680. Its totient is φ = 26838284748.

The previous prime is 31311332197. The next prime is 31311332249. The reversal of 31311332213 is 31223311313.

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 cyclic number.

It is not a de Polignac number, because 31311332213 - 2⁴ = 31311332197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311332293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2236523723 + ... + 2236523736.

It is an arithmetic number, because the mean of its divisors is an integer number (8946094920).

Almost surely, 2^31311332213 is an apocalyptic number.

It is an amenable number.

31311332213 is a deficient number, since it is larger than the sum of its proper divisors (4473047467).

31311332213 is an equidigital number, since it uses as much as digits as its factorization.

31311332213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4473047466.

The product of its digits is 972, while the sum is 23.

Adding to 31311332213 its reverse (31223311313), we get a palindrome (62534643526).

The spelling of 31311332213 in words is "thirty-one billion, three hundred eleven million, three hundred thirty-two thousand, two hundred thirteen".