31311113 has 2 divisors, whose sum is σ = 31311114. Its totient is φ = 31311112.

The previous prime is 31311109. The next prime is 31311121. The reversal of 31311113 is 31111313.

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., 30327049 + 984064 = 5507^2 + 992^2 .

It is an emirp because it is prime and its reverse (31111313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31311113 - 2² = 31311109 is a prime.

It is not a weakly prime, because it can be changed into another prime (31311143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655556 + 15655557.

It is an arithmetic number, because the mean of its divisors is an integer number (15655557).

Almost surely, 2^31311113 is an apocalyptic number.

It is an amenable number.

31311113 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311113 is an equidigital number, since it uses as much as digits as its factorization.

31311113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27, while the sum is 14.

The square root of 31311113 is about 5595.6333868473. The cubic root of 31311113 is about 315.1854555858.

Adding to 31311113 its reverse (31111313), we get a palindrome (62422426).

The spelling of 31311113 in words is "thirty-one million, three hundred eleven thousand, one hundred thirteen".