31613143 has 2 divisors, whose sum is σ = 31613144. Its totient is φ = 31613142.

The previous prime is 31613137. The next prime is 31613171. The reversal of 31613143 is 34131613.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31613143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31613243) 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, 15806571 + 15806572.

It is an arithmetic number, because the mean of its divisors is an integer number (15806572).

Almost surely, 2^31613143 is an apocalyptic number.

31613143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31613143 is an equidigital number, since it uses as much as digits as its factorization.

31613143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 22.

The square root of 31613143 is about 5622.5566248816. The cubic root of 31613143 is about 316.1956507498.

Adding to 31613143 its reverse (34131613), we get a palindrome (65744756).

The spelling of 31613143 in words is "thirty-one million, six hundred thirteen thousand, one hundred forty-three".