312311220331 has 32 divisors (see below), whose sum is σ = 364667731200. Its totient is φ = 264455280000.

The previous prime is 312311220329. The next prime is 312311220337. The reversal of 312311220331 is 133022113213.

It is a cyclic number.

It is not a de Polignac number, because 312311220331 - 2¹ = 312311220329 is a prime.

It is a super-2 number, since 2×312311220331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312311220337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47180740 + ... + 47187358.

It is an arithmetic number, because the mean of its divisors is an integer number (11395866600).

Almost surely, 2^312311220331 is an apocalyptic number.

312311220331 is a deficient number, since it is larger than the sum of its proper divisors (52356510869).

312311220331 is a wasteful number, since it uses less digits than its factorization.

312311220331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10411.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 312311220331 its reverse (133022113213), we get a palindrome (445333333544).

The spelling of 312311220331 in words is "three hundred twelve billion, three hundred eleven million, two hundred twenty thousand, three hundred thirty-one".