42542734830391 has 2 divisors, whose sum is σ = 42542734830392. Its totient is φ = 42542734830390.

The previous prime is 42542734830347. The next prime is 42542734830451. The reversal of 42542734830391 is 19303843724524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42542734830391 - 2⁷ = 42542734830263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42542734836391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21271367415195 + 21271367415196.

It is an arithmetic number, because the mean of its divisors is an integer number (21271367415196).

Almost surely, 2^{42542734830391} is an apocalyptic number.

42542734830391 is a deficient number, since it is larger than the sum of its proper divisors (1).

42542734830391 is an equidigital number, since it uses as much as digits as its factorization.

42542734830391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17418240, while the sum is 55.

The spelling of 42542734830391 in words is "forty-two trillion, five hundred forty-two billion, seven hundred thirty-four million, eight hundred thirty thousand, three hundred ninety-one".