42112081391 has 2 divisors, whose sum is σ = 42112081392. Its totient is φ = 42112081390.

The previous prime is 42112081367. The next prime is 42112081447. The reversal of 42112081391 is 19318021124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42112081391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42112081331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21056040695 + 21056040696.

It is an arithmetic number, because the mean of its divisors is an integer number (21056040696).

Almost surely, 2^42112081391 is an apocalyptic number.

42112081391 is a deficient number, since it is larger than the sum of its proper divisors (1).

42112081391 is an equidigital number, since it uses as much as digits as its factorization.

42112081391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The spelling of 42112081391 in words is "forty-two billion, one hundred twelve million, eighty-one thousand, three hundred ninety-one".