31311132021343 has 4 divisors (see below), whose sum is σ = 31311517883368. Its totient is φ = 31310746159320.

The previous prime is 31311132021331. The next prime is 31311132021373. The reversal of 31311132021343 is 34312023111313.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31311132021343 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 (31311132021373) 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, 192809268 + ... + 192971593.

It is an arithmetic number, because the mean of its divisors is an integer number (7827879470842).

Almost surely, 2^{31311132021343} is an apocalyptic number.

31311132021343 is a deficient number, since it is larger than the sum of its proper divisors (385862025).

31311132021343 is an equidigital number, since it uses as much as digits as its factorization.

31311132021343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385862024.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 31311132021343 its reverse (34312023111313), we get a palindrome (65623155132656).

The spelling of 31311132021343 in words is "thirty-one trillion, three hundred eleven billion, one hundred thirty-two million, twenty-one thousand, three hundred forty-three".