42275561 has 2 divisors, whose sum is σ = 42275562. Its totient is φ = 42275560.

The previous prime is 42275539. The next prime is 42275581. The reversal of 42275561 is 16557224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38875225 + 3400336 = 6235^2 + 1844^2 .

It is a cyclic number.

It is not a de Polignac number, because 42275561 - 2¹⁰ = 42274537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42275521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21137780 + 21137781.

It is an arithmetic number, because the mean of its divisors is an integer number (21137781).

Almost surely, 2^42275561 is an apocalyptic number.

It is an amenable number.

42275561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42275561 is an equidigital number, since it uses as much as digits as its factorization.

42275561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 32.

The square root of 42275561 is about 6501.9659334697. The cubic root of 42275561 is about 348.3612122301.

The spelling of 42275561 in words is "forty-two million, two hundred seventy-five thousand, five hundred sixty-one".