31310031311 has 4 divisors (see below), whose sum is σ = 33718495272. Its totient is φ = 28901567352.

The previous prime is 31310031289. The next prime is 31310031317. The reversal of 31310031311 is 11313001313.

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 31310031311 - 2¹⁸ = 31309769167 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 31310031311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31310031317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1204231961 + ... + 1204231986.

It is an arithmetic number, because the mean of its divisors is an integer number (8429623818).

Almost surely, 2^31310031311 is an apocalyptic number.

31310031311 is a deficient number, since it is larger than the sum of its proper divisors (2408463961).

31310031311 is a wasteful number, since it uses less digits than its factorization.

31310031311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408463960.

The product of its (nonzero) digits is 81, while the sum is 17.

Adding to 31310031311 its reverse (11313001313), we get a palindrome (42623032624).

The spelling of 31310031311 in words is "thirty-one billion, three hundred ten million, thirty-one thousand, three hundred eleven".