31231320212311 has 2 divisors, whose sum is σ = 31231320212312. Its totient is φ = 31231320212310.

The previous prime is 31231320212273. The next prime is 31231320212387. The reversal of 31231320212311 is 11321202313213.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31231320212311 is a prime.

It is a super-2 number, since 2×31231320212311² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31231320218311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615660106155 + 15615660106156.

It is an arithmetic number, because the mean of its divisors is an integer number (15615660106156).

Almost surely, 2^{31231320212311} is an apocalyptic number.

31231320212311 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231320212311 is an equidigital number, since it uses as much as digits as its factorization.

31231320212311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31231320212311 its reverse (11321202313213), we get a palindrome (42552522525524).

The spelling of 31231320212311 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred twenty million, two hundred twelve thousand, three hundred eleven".