31384313 has 2 divisors, whose sum is σ = 31384314. Its totient is φ = 31384312.

The previous prime is 31384271. The next prime is 31384319. The reversal of 31384313 is 31348313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31214569 + 169744 = 5587^2 + 412^2 .

It is a cyclic number.

It is not a de Polignac number, because 31384313 - 2²⁰ = 30335737 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31384319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15692156 + 15692157.

It is an arithmetic number, because the mean of its divisors is an integer number (15692157).

Almost surely, 2^31384313 is an apocalyptic number.

It is an amenable number.

31384313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31384313 is an equidigital number, since it uses as much as digits as its factorization.

31384313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 31384313 is about 5602.1703829855. The cubic root of 31384313 is about 315.4308809032.

The spelling of 31384313 in words is "thirty-one million, three hundred eighty-four thousand, three hundred thirteen".