247055720209 has 3 divisors (see below), whose sum is σ = 247056217257. Its totient is φ = 247055223162.

The previous prime is 247055720143. The next prime is 247055720221. The reversal of 247055720209 is 902027550742.

The square root of 247055720209 is 497047.

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

247055720209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 247055720209 - 2⁹ = 247055719697 is a prime.

It is a super-2 number, since 2×247055720209² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247055720279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 248524 + ... + 745570.

It is an arithmetic number, because the mean of its divisors is an integer number (82352072419).

Almost surely, 2^247055720209 is an apocalyptic number.

247055720209 is the 497047-th square number.

247055720209 is the 248524-th centered octagonal number.

It is an amenable number.

247055720209 is a deficient number, since it is larger than the sum of its proper divisors (497048).

247055720209 is an frugal number, since it uses more digits than its factorization.

247055720209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994094 (or 497047 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 247055720209 in words is "two hundred forty-seven billion, fifty-five million, seven hundred twenty thousand, two hundred nine".