31311200312321 has 2 divisors, whose sum is σ = 31311200312322. Its totient is φ = 31311200312320.

The previous prime is 31311200312309. The next prime is 31311200312333. The reversal of 31311200312321 is 12321300211313.

It is a balanced prime because it is at equal distance from previous prime (31311200312309) and next prime (31311200312333).

It can be written as a sum of positive squares in only one way, i.e., 29960723902321 + 1350476410000 = 5473639^2 + 1162100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31311200312321 is a prime.

It is not a weakly prime, because it can be changed into another prime (31311200312621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655600156160 + 15655600156161.

It is an arithmetic number, because the mean of its divisors is an integer number (15655600156161).

Almost surely, 2^{31311200312321} is an apocalyptic number.

It is an amenable number.

31311200312321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311200312321 is an equidigital number, since it uses as much as digits as its factorization.

31311200312321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31311200312321 its reverse (12321300211313), we get a palindrome (43632500523634).

The spelling of 31311200312321 in words is "thirty-one trillion, three hundred eleven billion, two hundred million, three hundred twelve thousand, three hundred twenty-one".