247668481 has 2 divisors, whose sum is σ = 247668482. Its totient is φ = 247668480.

The previous prime is 247668457. The next prime is 247668503. The reversal of 247668481 is 184866742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244640881 + 3027600 = 15641^2 + 1740^2 .

It is a cyclic number.

It is not a de Polignac number, because 247668481 - 2⁹ = 247667969 is a prime.

It is a super-2 number, since 2×247668481² = 122679352961694722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247668581) 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, 123834240 + 123834241.

It is an arithmetic number, because the mean of its divisors is an integer number (123834241).

Almost surely, 2^247668481 is an apocalyptic number.

It is an amenable number.

247668481 is a deficient number, since it is larger than the sum of its proper divisors (1).

247668481 is an equidigital number, since it uses as much as digits as its factorization.

247668481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 46.

The square root of 247668481 is about 15737.4864892714. The cubic root of 247668481 is about 627.9960520463.

The spelling of 247668481 in words is "two hundred forty-seven million, six hundred sixty-eight thousand, four hundred eighty-one".