31031323 has 2 divisors, whose sum is σ = 31031324. Its totient is φ = 31031322.

The previous prime is 31031317. The next prime is 31031339. The reversal of 31031323 is 32313013.

It is an a-pointer prime, because the next prime (31031339) can be obtained adding 31031323 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31031323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31031297 and 31031306.

It is not a weakly prime, because it can be changed into another prime (31031303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515661 + 15515662.

It is an arithmetic number, because the mean of its divisors is an integer number (15515662).

Almost surely, 2^31031323 is an apocalyptic number.

31031323 is a deficient number, since it is larger than the sum of its proper divisors (1).

31031323 is an equidigital number, since it uses as much as digits as its factorization.

31031323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 31031323 is about 5570.5765410772. The cubic root of 31031323 is about 314.2438333508.

Adding to 31031323 its reverse (32313013), we get a palindrome (63344336).

The spelling of 31031323 in words is "thirty-one million, thirty-one thousand, three hundred twenty-three".