298409561 has 2 divisors, whose sum is σ = 298409562. Its totient is φ = 298409560.

The previous prime is 298409549. The next prime is 298409563. The reversal of 298409561 is 165904892.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261016336 + 37393225 = 16156^2 + 6115^2 .

It is a cyclic number.

It is not a de Polignac number, because 298409561 - 2²⁶ = 231300697 is a prime.

It is a Sophie Germain prime.

Together with 298409563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (298409563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 149204780 + 149204781.

It is an arithmetic number, because the mean of its divisors is an integer number (149204781).

Almost surely, 2^298409561 is an apocalyptic number.

It is an amenable number.

298409561 is a deficient number, since it is larger than the sum of its proper divisors (1).

298409561 is an equidigital number, since it uses as much as digits as its factorization.

298409561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 298409561 is about 17274.5350443941. The cubic root of 298409561 is about 668.2478619617.

The spelling of 298409561 in words is "two hundred ninety-eight million, four hundred nine thousand, five hundred sixty-one".