609210409 has 2 divisors, whose sum is σ = 609210410. Its totient is φ = 609210408.

The previous prime is 609210403. The next prime is 609210457. The reversal of 609210409 is 904012906.

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., 607770409 + 1440000 = 24653^2 + 1200^2 .

It is a cyclic number.

It is not a de Polignac number, because 609210409 - 2³ = 609210401 is a prime.

It is a super-2 number, since 2×609210409² = 742274644867894562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (609210401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304605204 + 304605205.

It is an arithmetic number, because the mean of its divisors is an integer number (304605205).

Almost surely, 2^609210409 is an apocalyptic number.

It is an amenable number.

609210409 is a deficient number, since it is larger than the sum of its proper divisors (1).

609210409 is an equidigital number, since it uses as much as digits as its factorization.

609210409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 609210409 is about 24682.1880918204. The cubic root of 609210409 is about 847.7265239135.

The spelling of 609210409 in words is "six hundred nine million, two hundred ten thousand, four hundred nine".