247009 has 9 divisors (see below), whose sum is σ = 291441. Its totient is φ = 208740.

The previous prime is 247007. The next prime is 247031. The reversal of 247009 is 900742.

247009 = T₄₉₆ + T₄₉₇.

The square root of 247009 is 497.

It is a perfect power (a square), and thus also a powerful number.

247009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 247009 - 2¹ = 247007 is a prime.

It is a super-2 number, since 2×247009² = 122026892162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247001) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3444 + ... + 3514.

247009 is a Friedman number, since it can be written as 497^(2+0+0), using all its digits and the basic arithmetic operations.

2²⁴⁷⁰⁰⁹ is an apocalyptic number.

247009 is the 497-th square number.

247009 is the 249-th centered octagonal number.

It is an amenable number.

247009 is a deficient number, since it is larger than the sum of its proper divisors (44432).

247009 is an frugal number, since it uses more digits than its factorization.

247009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The cubic root of 247009 is about 62.7438156262.

The spelling of 247009 in words is "two hundred forty-seven thousand, nine".