231321313331 has 8 divisors (see below), whose sum is σ = 233594025984. Its totient is φ = 229050653320.

The previous prime is 231321313271. The next prime is 231321313351. The reversal of 231321313331 is 133313123132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231321313331 is a prime.

It is a super-2 number, since 2×231321313331² (a number of 24 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 231321313331.

It is not an unprimeable number, because it can be changed into a prime (231321313351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286175 + ... + 737928.

It is an arithmetic number, because the mean of its divisors is an integer number (29199253248).

Almost surely, 2^231321313331 is an apocalyptic number.

231321313331 is a deficient number, since it is larger than the sum of its proper divisors (2272712653).

231321313331 is a wasteful number, since it uses less digits than its factorization.

231321313331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026321.

The product of its digits is 2916, while the sum is 26.

Adding to 231321313331 its reverse (133313123132), we get a palindrome (364634436463).

The spelling of 231321313331 in words is "two hundred thirty-one billion, three hundred twenty-one million, three hundred thirteen thousand, three hundred thirty-one".