42842239997 has 2 divisors, whose sum is σ = 42842239998. Its totient is φ = 42842239996.

The previous prime is 42842239991. The next prime is 42842240053. The reversal of 42842239997 is 79993224824.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34184681881 + 8657558116 = 184891^2 + 93046^2 .

It is a cyclic number.

It is not a de Polignac number, because 42842239997 - 2⁶ = 42842239933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42842239991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21421119998 + 21421119999.

It is an arithmetic number, because the mean of its divisors is an integer number (21421119999).

Almost surely, 2^42842239997 is an apocalyptic number.

It is an amenable number.

42842239997 is a deficient number, since it is larger than the sum of its proper divisors (1).

42842239997 is an equidigital number, since it uses as much as digits as its factorization.

42842239997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15676416, while the sum is 59.

The spelling of 42842239997 in words is "forty-two billion, eight hundred forty-two million, two hundred thirty-nine thousand, nine hundred ninety-seven".