42105449 has 2 divisors, whose sum is σ = 42105450. Its totient is φ = 42105448.

The previous prime is 42105407. The next prime is 42105461. The reversal of 42105449 is 94450124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34987225 + 7118224 = 5915^2 + 2668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42105449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42105649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21052724 + 21052725.

It is an arithmetic number, because the mean of its divisors is an integer number (21052725).

Almost surely, 2^42105449 is an apocalyptic number.

It is an amenable number.

42105449 is a deficient number, since it is larger than the sum of its proper divisors (1).

42105449 is an equidigital number, since it uses as much as digits as its factorization.

42105449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 42105449 is about 6488.8711653107. The cubic root of 42105449 is about 347.8933289345.

The spelling of 42105449 in words is "forty-two million, one hundred five thousand, four hundred forty-nine".