247220245 has 4 divisors (see below), whose sum is σ = 296664300. Its totient is φ = 197776192.

The previous prime is 247220243. The next prime is 247220279. The reversal of 247220245 is 542022742.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542022742 = 2 ⋅271011371.

It can be written as a sum of positive squares in 2 ways, for example, as 141562404 + 105657841 = 11898^2 + 10279^2 .

It is a cyclic number.

It is not a de Polignac number, because 247220245 - 2¹ = 247220243 is a prime.

It is a super-2 number, since 2×247220245² = 122235699075720050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247220243) 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 in 3 ways as a sum of consecutive naturals, for example, 24722020 + ... + 24722029.

It is an arithmetic number, because the mean of its divisors is an integer number (74166075).

Almost surely, 2^247220245 is an apocalyptic number.

It is an amenable number.

247220245 is a deficient number, since it is larger than the sum of its proper divisors (49444055).

247220245 is an equidigital number, since it uses as much as digits as its factorization.

247220245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49444054.

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 247220245 is about 15723.2390110944. The cubic root of 247220245 is about 627.6169694596.

Adding to 247220245 its reverse (542022742), we get a palindrome (789242987).

The spelling of 247220245 in words is "two hundred forty-seven million, two hundred twenty thousand, two hundred forty-five".