31311143 has 2 divisors, whose sum is σ = 31311144. Its totient is φ = 31311142.

The previous prime is 31311131. The next prime is 31311157. The reversal of 31311143 is 34111313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31311143 - 2¹⁴ = 31294759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31311113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655571 + 15655572.

It is an arithmetic number, because the mean of its divisors is an integer number (15655572).

Almost surely, 2^31311143 is an apocalyptic number.

31311143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311143 is an equidigital number, since it uses as much as digits as its factorization.

31311143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 17.

The square root of 31311143 is about 5595.6360675083. The cubic root of 31311143 is about 315.1855562483.

Adding to 31311143 its reverse (34111313), we get a palindrome (65422456).

The spelling of 31311143 in words is "thirty-one million, three hundred eleven thousand, one hundred forty-three".