247478378489 has 2 divisors, whose sum is σ = 247478378490. Its totient is φ = 247478378488.

The previous prime is 247478378419. The next prime is 247478378491. The reversal of 247478378489 is 984873874742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241973480464 + 5504898025 = 491908^2 + 74195^2 .

It is a cyclic number.

It is not a de Polignac number, because 247478378489 - 2¹² = 247478374393 is a prime.

It is a super-2 number, since 2×247478378489² (a number of 24 digits) contains 22 as substring.

Together with 247478378491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (247478378419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123739189244 + 123739189245.

It is an arithmetic number, because the mean of its divisors is an integer number (123739189245).

Almost surely, 2^247478378489 is an apocalyptic number.

It is an amenable number.

247478378489 is a deficient number, since it is larger than the sum of its proper divisors (1).

247478378489 is an equidigital number, since it uses as much as digits as its factorization.

247478378489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 606928896, while the sum is 71.

The spelling of 247478378489 in words is "two hundred forty-seven billion, four hundred seventy-eight million, three hundred seventy-eight thousand, four hundred eighty-nine".