247454561 has 2 divisors, whose sum is σ = 247454562. Its totient is φ = 247454560.

The previous prime is 247454531. The next prime is 247454563. The reversal of 247454561 is 165454742.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172528225 + 74926336 = 13135^2 + 8656^2 .

It is a cyclic number.

It is not a de Polignac number, because 247454561 - 2¹⁰ = 247453537 is a prime.

It is a super-2 number, since 2×247454561² = 122467519519405442, which contains 22 as substring.

Together with 247454563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (247454563) 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, 123727280 + 123727281.

It is an arithmetic number, because the mean of its divisors is an integer number (123727281).

Almost surely, 2^247454561 is an apocalyptic number.

It is an amenable number.

247454561 is a deficient number, since it is larger than the sum of its proper divisors (1).

247454561 is an equidigital number, since it uses as much as digits as its factorization.

247454561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 38.

The square root of 247454561 is about 15730.6885100430. The cubic root of 247454561 is about 627.8151925201.

The spelling of 247454561 in words is "two hundred forty-seven million, four hundred fifty-four thousand, five hundred sixty-one".