247277279 has 2 divisors, whose sum is σ = 247277280. Its totient is φ = 247277278.

The previous prime is 247277269. The next prime is 247277281. The reversal of 247277279 is 972772742.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247277279 is a prime.

It is a super-2 number, since 2×247277279² = 122292105419287682, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 247277281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247277249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123638639 + 123638640.

It is an arithmetic number, because the mean of its divisors is an integer number (123638640).

Almost surely, 2^247277279 is an apocalyptic number.

247277279 is a deficient number, since it is larger than the sum of its proper divisors (1).

247277279 is an equidigital number, since it uses as much as digits as its factorization.

247277279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691488, while the sum is 47.

The square root of 247277279 is about 15725.0525913270. The cubic root of 247277279 is about 627.6652297385.

The spelling of 247277279 in words is "two hundred forty-seven million, two hundred seventy-seven thousand, two hundred seventy-nine".