42997217849 has 2 divisors, whose sum is σ = 42997217850. Its totient is φ = 42997217848.

The previous prime is 42997217821. The next prime is 42997217869. The reversal of 42997217849 is 94871279924.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41598457849 + 1398760000 = 203957^2 + 37400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42997217849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42997217791 and 42997217800.

It is not a weakly prime, because it can be changed into another prime (42997217869) 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, 21498608924 + 21498608925.

It is an arithmetic number, because the mean of its divisors is an integer number (21498608925).

Almost surely, 2^42997217849 is an apocalyptic number.

It is an amenable number.

42997217849 is a deficient number, since it is larger than the sum of its proper divisors (1).

42997217849 is an equidigital number, since it uses as much as digits as its factorization.

42997217849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 62.

The spelling of 42997217849 in words is "forty-two billion, nine hundred ninety-seven million, two hundred seventeen thousand, eight hundred forty-nine".