31530143 has 2 divisors, whose sum is σ = 31530144. Its totient is φ = 31530142.

The previous prime is 31530097. The next prime is 31530173. The reversal of 31530143 is 34103513.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31530143 - 2²² = 27335839 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31530173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15765071 + 15765072.

It is an arithmetic number, because the mean of its divisors is an integer number (15765072).

Almost surely, 2^31530143 is an apocalyptic number.

31530143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31530143 is an equidigital number, since it uses as much as digits as its factorization.

31530143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 31530143 is about 5615.1707899226. The cubic root of 31530143 is about 315.9186853479.

Adding to 31530143 its reverse (34103513), we get a palindrome (65633656).

The spelling of 31530143 in words is "thirty-one million, five hundred thirty thousand, one hundred forty-three".