42431785771 has 2 divisors, whose sum is σ = 42431785772. Its totient is φ = 42431785770.

The previous prime is 42431785751. The next prime is 42431785793. The reversal of 42431785771 is 17758713424.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42431785771 is a prime.

It is not a weakly prime, because it can be changed into another prime (42431785751) 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, 21215892885 + 21215892886.

It is an arithmetic number, because the mean of its divisors is an integer number (21215892886).

Almost surely, 2^42431785771 is an apocalyptic number.

42431785771 is a deficient number, since it is larger than the sum of its proper divisors (1).

42431785771 is an equidigital number, since it uses as much as digits as its factorization.

42431785771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1317120, while the sum is 49.

The spelling of 42431785771 in words is "forty-two billion, four hundred thirty-one million, seven hundred eighty-five thousand, seven hundred seventy-one".