42225257 has 2 divisors, whose sum is σ = 42225258. Its totient is φ = 42225256.

The previous prime is 42225173. The next prime is 42225283. The reversal of 42225257 is 75252224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40309801 + 1915456 = 6349^2 + 1384^2 .

It is a cyclic number.

It is not a de Polignac number, because 42225257 - 2¹⁸ = 41963113 is a prime.

It is not a weakly prime, because it can be changed into another prime (42225457) 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, 21112628 + 21112629.

It is an arithmetic number, because the mean of its divisors is an integer number (21112629).

Almost surely, 2^42225257 is an apocalyptic number.

It is an amenable number.

42225257 is a deficient number, since it is larger than the sum of its proper divisors (1).

42225257 is an equidigital number, since it uses as much as digits as its factorization.

42225257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11200, while the sum is 29.

The square root of 42225257 is about 6498.0964135661. The cubic root of 42225257 is about 348.2229848694. Note that the first 3 decimals are identical.

The spelling of 42225257 in words is "forty-two million, two hundred twenty-five thousand, two hundred fifty-seven".