247223279 has 2 divisors, whose sum is σ = 247223280. Its totient is φ = 247223278.

The previous prime is 247223237. The next prime is 247223303. The reversal of 247223279 is 972322742.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247223279 - 2⁸ = 247223023 is a prime.

It is a super-2 number, since 2×247223279² = 122238699359023682, which contains 22 as substring.

It is a Chen prime.

It is equal to p_13535588 and since 247223279 and 13535588 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247220279) 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, 123611639 + 123611640.

It is an arithmetic number, because the mean of its divisors is an integer number (123611640).

Almost surely, 2^247223279 is an apocalyptic number.

247223279 is a deficient number, since it is larger than the sum of its proper divisors (1).

247223279 is an equidigital number, since it uses as much as digits as its factorization.

247223279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 38.

The square root of 247223279 is about 15723.3354921912. The cubic root of 247223279 is about 627.6195369166.

The spelling of 247223279 in words is "two hundred forty-seven million, two hundred twenty-three thousand, two hundred seventy-nine".