42743494991 has 2 divisors, whose sum is σ = 42743494992. Its totient is φ = 42743494990.

The previous prime is 42743494973. The next prime is 42743495117. The reversal of 42743494991 is 19949434724.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42743494991 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42743494931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21371747495 + 21371747496.

It is an arithmetic number, because the mean of its divisors is an integer number (21371747496).

Almost surely, 2^42743494991 is an apocalyptic number.

42743494991 is a deficient number, since it is larger than the sum of its proper divisors (1).

42743494991 is an equidigital number, since it uses as much as digits as its factorization.

42743494991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 56.

The spelling of 42743494991 in words is "forty-two billion, seven hundred forty-three million, four hundred ninety-four thousand, nine hundred ninety-one".