609749281 has 2 divisors, whose sum is σ = 609749282. Its totient is φ = 609749280.

The previous prime is 609749279. The next prime is 609749293. The reversal of 609749281 is 182947906.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 529736256 + 80013025 = 23016^2 + 8945^2 .

It is a cyclic number.

It is not a de Polignac number, because 609749281 - 2¹ = 609749279 is a prime.

It is a super-2 number, since 2×609749281² = 743588371360033922, which contains 22 as substring.

Together with 609749279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (609749201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304874640 + 304874641.

It is an arithmetic number, because the mean of its divisors is an integer number (304874641).

Almost surely, 2^609749281 is an apocalyptic number.

It is an amenable number.

609749281 is a deficient number, since it is larger than the sum of its proper divisors (1).

609749281 is an equidigital number, since it uses as much as digits as its factorization.

609749281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 609749281 is about 24693.1018910140. The cubic root of 609749281 is about 847.9764000678.

The spelling of 609749281 in words is "six hundred nine million, seven hundred forty-nine thousand, two hundred eighty-one".