247123879 has 2 divisors, whose sum is σ = 247123880. Its totient is φ = 247123878.

The previous prime is 247123867. The next prime is 247123889. The reversal of 247123879 is 978321742.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247123879 - 2¹⁷ = 246992807 is a prime.

It is a super-2 number, since 2×247123879² = 122140423144013282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247123859) 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, 123561939 + 123561940.

It is an arithmetic number, because the mean of its divisors is an integer number (123561940).

Almost surely, 2^247123879 is an apocalyptic number.

247123879 is a deficient number, since it is larger than the sum of its proper divisors (1).

247123879 is an equidigital number, since it uses as much as digits as its factorization.

247123879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 43.

The square root of 247123879 is about 15720.1742674819. The cubic root of 247123879 is about 627.5354108787.

The spelling of 247123879 in words is "two hundred forty-seven million, one hundred twenty-three thousand, eight hundred seventy-nine".