42155231171 has 2 divisors, whose sum is σ = 42155231172. Its totient is φ = 42155231170.

The previous prime is 42155231147. The next prime is 42155231207. The reversal of 42155231171 is 17113255124.

42155231171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42155231171 - 2¹⁰ = 42155230147 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (42155231101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21077615585 + 21077615586.

It is an arithmetic number, because the mean of its divisors is an integer number (21077615586).

Almost surely, 2^42155231171 is an apocalyptic number.

42155231171 is a deficient number, since it is larger than the sum of its proper divisors (1).

42155231171 is an equidigital number, since it uses as much as digits as its factorization.

42155231171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

Adding to 42155231171 its reverse (17113255124), we get a palindrome (59268486295).

The spelling of 42155231171 in words is "forty-two billion, one hundred fifty-five million, two hundred thirty-one thousand, one hundred seventy-one".