247941647 has 2 divisors, whose sum is σ = 247941648. Its totient is φ = 247941646.

The previous prime is 247941643. The next prime is 247941691. The reversal of 247941647 is 746149742.

It is an a-pointer prime, because the next prime (247941691) can be obtained adding 247941647 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 247941647 - 2² = 247941643 is a prime.

It is a super-2 number, since 2×247941647² = 122950120634145218, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 247941598 and 247941607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247941643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123970823 + 123970824.

It is an arithmetic number, because the mean of its divisors is an integer number (123970824).

Almost surely, 2^247941647 is an apocalyptic number.

247941647 is a deficient number, since it is larger than the sum of its proper divisors (1).

247941647 is an equidigital number, since it uses as much as digits as its factorization.

247941647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 44.

The square root of 247941647 is about 15746.1629294251. The cubic root of 247941647 is about 628.2268500040.

The spelling of 247941647 in words is "two hundred forty-seven million, nine hundred forty-one thousand, six hundred forty-seven".