31542540542431 has 2 divisors, whose sum is σ = 31542540542432. Its totient is φ = 31542540542430.

The previous prime is 31542540542419. The next prime is 31542540542441. The reversal of 31542540542431 is 13424504524513.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13424504524513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31542540542431 - 2²¹ = 31542538445279 is a prime.

It is a super-2 number, since 2×31542540542431² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31542540542441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15771270271215 + 15771270271216.

It is an arithmetic number, because the mean of its divisors is an integer number (15771270271216).

Almost surely, 2^{31542540542431} is an apocalyptic number.

31542540542431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31542540542431 is an equidigital number, since it uses as much as digits as its factorization.

31542540542431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152000, while the sum is 43.

The spelling of 31542540542431 in words is "thirty-one trillion, five hundred forty-two billion, five hundred forty million, five hundred forty-two thousand, four hundred thirty-one".