31211311313111 has 2 divisors, whose sum is σ = 31211311313112. Its totient is φ = 31211311313110.

The previous prime is 31211311313107. The next prime is 31211311313129. The reversal of 31211311313111 is 11131311311213.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31211311313111 - 2² = 31211311313107 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31211311313131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605655656555 + 15605655656556.

It is an arithmetic number, because the mean of its divisors is an integer number (15605655656556).

Almost surely, 2^{31211311313111} is an apocalyptic number.

31211311313111 is a deficient number, since it is larger than the sum of its proper divisors (1).

31211311313111 is an equidigital number, since it uses as much as digits as its factorization.

31211311313111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 23.

Adding to 31211311313111 its reverse (11131311311213), we get a palindrome (42342622624324).

The spelling of 31211311313111 in words is "thirty-one trillion, two hundred eleven billion, three hundred eleven million, three hundred thirteen thousand, one hundred eleven".