31311121310311 has 4 divisors (see below), whose sum is σ = 31311151896672. Its totient is φ = 31311090723952.

The previous prime is 31311121310267. The next prime is 31311121310333. The reversal of 31311121310311 is 11301312111313.

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 31311121310311 - 2⁴¹ = 29112098054759 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 (31311121310011) 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, 13702486 + ... + 15823411.

It is an arithmetic number, because the mean of its divisors is an integer number (7827787974168).

Almost surely, 2^{31311121310311} is an apocalyptic number.

31311121310311 is a deficient number, since it is larger than the sum of its proper divisors (30586361).

31311121310311 is a wasteful number, since it uses less digits than its factorization.

31311121310311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30586360.

The product of its (nonzero) digits is 162, while the sum is 22.

Adding to 31311121310311 its reverse (11301312111313), we get a palindrome (42612433421624).

The spelling of 31311121310311 in words is "thirty-one trillion, three hundred eleven billion, one hundred twenty-one million, three hundred ten thousand, three hundred eleven".