31311323131213 has 32 divisors (see below), whose sum is σ = 33649579042560. Its totient is φ = 29044428940800.

The previous prime is 31311323131199. The next prime is 31311323131267. The reversal of 31311323131213 is 31213132311313.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31311323131213 - 2¹³ = 31311323123021 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 (31311323131273) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1237442320 + ... + 1237467622.

It is an arithmetic number, because the mean of its divisors is an integer number (1051549345080).

Almost surely, 2^{31311323131213} is an apocalyptic number.

It is an amenable number.

31311323131213 is a deficient number, since it is larger than the sum of its proper divisors (2338255911347).

31311323131213 is a wasteful number, since it uses less digits than its factorization.

31311323131213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27829.

The product of its digits is 2916, while the sum is 28.

Adding to 31311323131213 its reverse (31213132311313), we get a palindrome (62524455442526).

The spelling of 31311323131213 in words is "thirty-one trillion, three hundred eleven billion, three hundred twenty-three million, one hundred thirty-one thousand, two hundred thirteen".