425551409 has 2 divisors, whose sum is σ = 425551410. Its totient is φ = 425551408.

The previous prime is 425551403. The next prime is 425551421. The reversal of 425551409 is 904155524.

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., 271096225 + 154455184 = 16465^2 + 12428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-425551409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (425551403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212775704 + 212775705.

It is an arithmetic number, because the mean of its divisors is an integer number (212775705).

Almost surely, 2^425551409 is an apocalyptic number.

It is an amenable number.

425551409 is a deficient number, since it is larger than the sum of its proper divisors (1).

425551409 is an equidigital number, since it uses as much as digits as its factorization.

425551409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 425551409 is about 20628.8974256987. The cubic root of 425551409 is about 752.1723147310.

The spelling of 425551409 in words is "four hundred twenty-five million, five hundred fifty-one thousand, four hundred nine".