31142543 has 2 divisors, whose sum is σ = 31142544. Its totient is φ = 31142542.

The previous prime is 31142537. The next prime is 31142557. The reversal of 31142543 is 34524113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31142543 - 2⁶ = 31142479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31142593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571271 + 15571272.

It is an arithmetic number, because the mean of its divisors is an integer number (15571272).

Almost surely, 2^31142543 is an apocalyptic number.

31142543 is a deficient number, since it is larger than the sum of its proper divisors (1).

31142543 is an equidigital number, since it uses as much as digits as its factorization.

31142543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 23.

The square root of 31142543 is about 5580.5504208814. The cubic root of 31142543 is about 314.6188149659.

Adding to 31142543 its reverse (34524113), we get a palindrome (65666656).

The spelling of 31142543 in words is "thirty-one million, one hundred forty-two thousand, five hundred forty-three".