31112143 has 2 divisors, whose sum is σ = 31112144. Its totient is φ = 31112142.

The previous prime is 31112131. The next prime is 31112149. The reversal of 31112143 is 34121113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31112143 - 2²¹ = 29014991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31112149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556071 + 15556072.

It is an arithmetic number, because the mean of its divisors is an integer number (15556072).

Almost surely, 2^31112143 is an apocalyptic number.

31112143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31112143 is an equidigital number, since it uses as much as digits as its factorization.

31112143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 16.

The square root of 31112143 is about 5577.8260101943. The cubic root of 31112143 is about 314.5164092227.

Adding to 31112143 its reverse (34121113), we get a palindrome (65233256).

The spelling of 31112143 in words is "thirty-one million, one hundred twelve thousand, one hundred forty-three".