247484779 has 2 divisors, whose sum is σ = 247484780. Its totient is φ = 247484778.

The previous prime is 247484777. The next prime is 247484789. The reversal of 247484779 is 977484742.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 247484779 - 2¹ = 247484777 is a prime.

It is a super-2 number, since 2×247484779² = 122497431673357682, which contains 22 as substring.

Together with 247484777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (247484777) 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 as a sum of consecutive naturals, namely, 123742389 + 123742390.

It is an arithmetic number, because the mean of its divisors is an integer number (123742390).

Almost surely, 2^247484779 is an apocalyptic number.

247484779 is a deficient number, since it is larger than the sum of its proper divisors (1).

247484779 is an equidigital number, since it uses as much as digits as its factorization.

247484779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3161088, while the sum is 52.

The square root of 247484779 is about 15731.6489599787. The cubic root of 247484779 is about 627.8407467703.

The spelling of 247484779 in words is "two hundred forty-seven million, four hundred eighty-four thousand, seven hundred seventy-nine".