247609 has 2 divisors, whose sum is σ = 247610. Its totient is φ = 247608.

The previous prime is 247607. The next prime is 247613. The reversal of 247609 is 906742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157609 + 90000 = 397^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 247609 - 2¹ = 247607 is a prime.

It is a super-2 number, since 2×247609² = 122620433762, which contains 22 as substring.

Together with 247607, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123804 + 123805.

It is an arithmetic number, because the mean of its divisors is an integer number (123805).

2²⁴⁷⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

247609 is a deficient number, since it is larger than the sum of its proper divisors (1).

247609 is an equidigital number, since it uses as much as digits as its factorization.

247609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 247609 is about 497.6032556164. The cubic root of 247609 is about 62.7945774051.

The spelling of 247609 in words is "two hundred forty-seven thousand, six hundred nine".