311311021231 has 8 divisors (see below), whose sum is σ = 355790395520. Its totient is φ = 266833239768.

The previous prime is 311311021223. The next prime is 311311021253. The reversal of 311311021231 is 132120113113.

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 311311021231 - 2³ = 311311021223 is a prime.

It is a super-2 number, since 2×311311021231² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 311311021199 and 311311021208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311311031231) 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, 55000 + ... + 790978.

It is an arithmetic number, because the mean of its divisors is an integer number (44473799440).

Almost surely, 2^311311021231 is an apocalyptic number.

311311021231 is a deficient number, since it is larger than the sum of its proper divisors (44479374289).

311311021231 is an equidigital number, since it uses as much as digits as its factorization.

311311021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796413.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 311311021231 its reverse (132120113113), we get a palindrome (443431134344).

The spelling of 311311021231 in words is "three hundred eleven billion, three hundred eleven million, twenty-one thousand, two hundred thirty-one".