42120726149 has 2 divisors, whose sum is σ = 42120726150. Its totient is φ = 42120726148.

The previous prime is 42120726121. The next prime is 42120726181. The reversal of 42120726149 is 94162702124.

42120726149 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 can be written as a sum of positive squares in only one way, i.e., 36818701924 + 5302024225 = 191882^2 + 72815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42120726149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42120726449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21060363074 + 21060363075.

It is an arithmetic number, because the mean of its divisors is an integer number (21060363075).

Almost surely, 2^42120726149 is an apocalyptic number.

It is an amenable number.

42120726149 is a deficient number, since it is larger than the sum of its proper divisors (1).

42120726149 is an equidigital number, since it uses as much as digits as its factorization.

42120726149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 42120726149 in words is "forty-two billion, one hundred twenty million, seven hundred twenty-six thousand, one hundred forty-nine".