31313211313331 has 4 divisors (see below), whose sum is σ = 31389771732600. Its totient is φ = 31236650894064.

The previous prime is 31313211313301. The next prime is 31313211313333. The reversal of 31313211313331 is 13331311231313.

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

It is a cyclic number.

It is not a de Polignac number, because 31313211313331 - 2¹⁰ = 31313211312307 is a prime.

It is a super-2 number, since 2×31313211313331² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31313211313294 and 31313211313303.

It is not an unprimeable number, because it can be changed into a prime (31313211313333) 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, 38280209021 + ... + 38280209838.

It is an arithmetic number, because the mean of its divisors is an integer number (7847442933150).

Almost surely, 2^{31313211313331} is an apocalyptic number.

31313211313331 is a deficient number, since it is larger than the sum of its proper divisors (76560419269).

31313211313331 is an equidigital number, since it uses as much as digits as its factorization.

31313211313331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76560419268.

The product of its digits is 4374, while the sum is 29.

Adding to 31313211313331 its reverse (13331311231313), we get a palindrome (44644522544644).

The spelling of 31313211313331 in words is "thirty-one trillion, three hundred thirteen billion, two hundred eleven million, three hundred thirteen thousand, three hundred thirty-one".