31111313 has 2 divisors, whose sum is σ = 31111314. Its totient is φ = 31111312.

The previous prime is 31111307. The next prime is 31111319. The reversal of 31111313 is 31311113.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (31111307) and next prime (31111319).

It can be written as a sum of positive squares in only one way, i.e., 21270544 + 9840769 = 4612^2 + 3137^2 .

It is an emirp because it is prime and its reverse (31311113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31111313 - 2⁸ = 31111057 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31111319) 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, 15555656 + 15555657.

It is an arithmetic number, because the mean of its divisors is an integer number (15555657).

Almost surely, 2^31111313 is an apocalyptic number.

It is an amenable number.

31111313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111313 is an equidigital number, since it uses as much as digits as its factorization.

31111313 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 31111313 is about 5577.7516079510. The cubic root of 31111313 is about 314.5136123411.

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

The spelling of 31111313 in words is "thirty-one million, one hundred eleven thousand, three hundred thirteen".