31231320211331 has 8 divisors (see below), whose sum is σ = 32377146033024. Its totient is φ = 30094142132160.

The previous prime is 31231320211261. The next prime is 31231320211397. The reversal of 31231320211331 is 13311202313213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31231320211331 - 2¹⁸ = 31231319949187 is a prime.

It is a super-2 number, since 2×31231320211331² (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 31231320211331.

It is not an unprimeable number, because it can be changed into a prime (31231320211031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2161928276 + ... + 2161942721.

It is an arithmetic number, because the mean of its divisors is an integer number (4047143254128).

Almost surely, 2^{31231320211331} is an apocalyptic number.

31231320211331 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31231320211331 is a deficient number, since it is larger than the sum of its proper divisors (1145825821693).

31231320211331 is a wasteful number, since it uses less digits than its factorization.

31231320211331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4323871261.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 31231320211331 its reverse (13311202313213), we get a palindrome (44542522524544).

The spelling of 31231320211331 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred twenty million, two hundred eleven thousand, three hundred thirty-one".