425706209 has 2 divisors, whose sum is σ = 425706210. Its totient is φ = 425706208.

The previous prime is 425706199. The next prime is 425706217. The reversal of 425706209 is 902607524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 367565584 + 58140625 = 19172^2 + 7625^2 .

It is a cyclic number.

It is not a de Polignac number, because 425706209 - 2¹⁶ = 425640673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (425706709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212853104 + 212853105.

It is an arithmetic number, because the mean of its divisors is an integer number (212853105).

Almost surely, 2^425706209 is an apocalyptic number.

It is an amenable number.

425706209 is a deficient number, since it is larger than the sum of its proper divisors (1).

425706209 is an equidigital number, since it uses as much as digits as its factorization.

425706209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 425706209 is about 20632.6491028176. The cubic root of 425706209 is about 752.2635079110.

The spelling of 425706209 in words is "four hundred twenty-five million, seven hundred six thousand, two hundred nine".