31520242543 has 2 divisors, whose sum is σ = 31520242544. Its totient is φ = 31520242542.

The previous prime is 31520242529. The next prime is 31520242547. The reversal of 31520242543 is 34524202513.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31520242543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31520242547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15760121271 + 15760121272.

It is an arithmetic number, because the mean of its divisors is an integer number (15760121272).

Almost surely, 2^31520242543 is an apocalyptic number.

31520242543 is a deficient number, since it is larger than the sum of its proper divisors (1).

31520242543 is an equidigital number, since it uses as much as digits as its factorization.

31520242543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 31.

The spelling of 31520242543 in words is "thirty-one billion, five hundred twenty million, two hundred forty-two thousand, five hundred forty-three".