31542139523 has 2 divisors, whose sum is σ = 31542139524. Its totient is φ = 31542139522.

The previous prime is 31542139493. The next prime is 31542139537. The reversal of 31542139523 is 32593124513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31542139523 - 2⁶ = 31542139459 is a prime.

It is not a weakly prime, because it can be changed into another prime (31542135523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15771069761 + 15771069762.

It is an arithmetic number, because the mean of its divisors is an integer number (15771069762).

Almost surely, 2^31542139523 is an apocalyptic number.

31542139523 is a deficient number, since it is larger than the sum of its proper divisors (1).

31542139523 is an equidigital number, since it uses as much as digits as its factorization.

31542139523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 38.

The spelling of 31542139523 in words is "thirty-one billion, five hundred forty-two million, one hundred thirty-nine thousand, five hundred twenty-three".