31321332310231 has 4 divisors (see below), whose sum is σ = 31717804871200. Its totient is φ = 30924859749264.

The previous prime is 31321332310201. The next prime is 31321332310249. The reversal of 31321332310231 is 13201323312313.

It is a happy number.

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 31321332310231 - 2¹⁹ = 31321331785943 is a prime.

It is a super-2 number, since 2×31321332310231² (a number of 28 digits) contains 22 as substring.

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 31321332310231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321332310201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198236280366 + ... + 198236280523.

It is an arithmetic number, because the mean of its divisors is an integer number (7929451217800).

Almost surely, 2^{31321332310231} is an apocalyptic number.

31321332310231 is a deficient number, since it is larger than the sum of its proper divisors (396472560969).

31321332310231 is an equidigital number, since it uses as much as digits as its factorization.

31321332310231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396472560968.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 31321332310231 its reverse (13201323312313), we get a palindrome (44522655622544).

The spelling of 31321332310231 in words is "thirty-one trillion, three hundred twenty-one billion, three hundred thirty-two million, three hundred ten thousand, two hundred thirty-one".