31101221113 has 2 divisors, whose sum is σ = 31101221114. Its totient is φ = 31101221112.

The previous prime is 31101221111. The next prime is 31101221171. The reversal of 31101221113 is 31112210113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29876431104 + 1224790009 = 172848^2 + 34997^2 .

It is a cyclic number.

It is not a de Polignac number, because 31101221113 - 2¹ = 31101221111 is a prime.

Together with 31101221111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31101221111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15550610556 + 15550610557.

It is an arithmetic number, because the mean of its divisors is an integer number (15550610557).

Almost surely, 2^31101221113 is an apocalyptic number.

It is an amenable number.

31101221113 is a deficient number, since it is larger than the sum of its proper divisors (1).

31101221113 is an equidigital number, since it uses as much as digits as its factorization.

31101221113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 31101221113 its reverse (31112210113), we get a palindrome (62213431226).

The spelling of 31101221113 in words is "thirty-one billion, one hundred one million, two hundred twenty-one thousand, one hundred thirteen".