42825217 has 2 divisors, whose sum is σ = 42825218. Its totient is φ = 42825216.

The previous prime is 42825191. The next prime is 42825269. The reversal of 42825217 is 71252824.

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., 38987536 + 3837681 = 6244^2 + 1959^2 .

It is a cyclic number.

It is not a de Polignac number, because 42825217 - 2⁷ = 42825089 is a prime.

It is a super-2 number, since 2×42825217² = 3667998422194178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42825617) 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, 21412608 + 21412609.

It is an arithmetic number, because the mean of its divisors is an integer number (21412609).

Almost surely, 2^42825217 is an apocalyptic number.

It is an amenable number.

42825217 is a deficient number, since it is larger than the sum of its proper divisors (1).

42825217 is an equidigital number, since it uses as much as digits as its factorization.

42825217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 31.

The square root of 42825217 is about 6544.0978751849. The cubic root of 42825217 is about 349.8644835906.

The spelling of 42825217 in words is "forty-two million, eight hundred twenty-five thousand, two hundred seventeen".