247242239 has 2 divisors, whose sum is σ = 247242240. Its totient is φ = 247242238.

The previous prime is 247242227. The next prime is 247242241. The reversal of 247242239 is 932242742.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247242239 - 2⁸ = 247241983 is a prime.

It is a super-2 number, since 2×247242239² = 122257449491466242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 247242241, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 247242199 and 247242208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247247239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123621119 + 123621120.

It is an arithmetic number, because the mean of its divisors is an integer number (123621120).

Almost surely, 2^247242239 is an apocalyptic number.

247242239 is a deficient number, since it is larger than the sum of its proper divisors (1).

247242239 is an equidigital number, since it uses as much as digits as its factorization.

247242239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 35.

The square root of 247242239 is about 15723.9384061373. The cubic root of 247242239 is about 627.6355809320.

The spelling of 247242239 in words is "two hundred forty-seven million, two hundred forty-two thousand, two hundred thirty-nine".