425609 has 2 divisors, whose sum is σ = 425610. Its totient is φ = 425608.

The previous prime is 425603. The next prime is 425641. The reversal of 425609 is 906524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384400 + 41209 = 620^2 + 203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-425609 is a prime.

It is a super-2 number, since 2×425609² = 362286041762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (425603) 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, 212804 + 212805.

It is an arithmetic number, because the mean of its divisors is an integer number (212805).

2⁴²⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

425609 is a deficient number, since it is larger than the sum of its proper divisors (1).

425609 is an equidigital number, since it uses as much as digits as its factorization.

425609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 425609 is about 652.3871549931. The cubic root of 425609 is about 75.2206244358.

The spelling of 425609 in words is "four hundred twenty-five thousand, six hundred nine".