247328989 has 2 divisors, whose sum is σ = 247328990. Its totient is φ = 247328988.

The previous prime is 247328839. The next prime is 247329001. The reversal of 247328989 is 989823742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182655225 + 64673764 = 13515^2 + 8042^2 .

It is a cyclic number.

It is not a de Polignac number, because 247328989 - 2¹¹ = 247326941 is a prime.

It is a super-2 number, since 2×247328989² = 122343257599524242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247328089) 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, 123664494 + 123664495.

It is an arithmetic number, because the mean of its divisors is an integer number (123664495).

Almost surely, 2^247328989 is an apocalyptic number.

It is an amenable number.

247328989 is a deficient number, since it is larger than the sum of its proper divisors (1).

247328989 is an equidigital number, since it uses as much as digits as its factorization.

247328989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 52.

The square root of 247328989 is about 15726.6966970181. The cubic root of 247328989 is about 627.7089786115.

The spelling of 247328989 in words is "two hundred forty-seven million, three hundred twenty-eight thousand, nine hundred eighty-nine".