427521209 has 2 divisors, whose sum is σ = 427521210. Its totient is φ = 427521208.

The previous prime is 427521181. The next prime is 427521247. The reversal of 427521209 is 902125724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 408161209 + 19360000 = 20203^2 + 4400^2 .

It is a cyclic number.

It is not a de Polignac number, because 427521209 - 2⁸ = 427520953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (427523209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213760604 + 213760605.

It is an arithmetic number, because the mean of its divisors is an integer number (213760605).

Almost surely, 2^427521209 is an apocalyptic number.

It is an amenable number.

427521209 is a deficient number, since it is larger than the sum of its proper divisors (1).

427521209 is an equidigital number, since it uses as much as digits as its factorization.

427521209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 427521209 is about 20676.5860093005. The cubic root of 427521209 is about 753.3310848907.

The spelling of 427521209 in words is "four hundred twenty-seven million, five hundred twenty-one thousand, two hundred nine".