240898561 has 2 divisors, whose sum is σ = 240898562. Its totient is φ = 240898560.

The previous prime is 240898543. The next prime is 240898589. The reversal of 240898561 is 165898042.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214066161 + 26832400 = 14631^2 + 5180^2 .

It is a cyclic number.

It is not a de Polignac number, because 240898561 - 2¹⁹ = 240374273 is a prime.

It is not a weakly prime, because it can be changed into another prime (240898531) 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, 120449280 + 120449281.

It is an arithmetic number, because the mean of its divisors is an integer number (120449281).

Almost surely, 2^240898561 is an apocalyptic number.

It is an amenable number.

240898561 is a deficient number, since it is larger than the sum of its proper divisors (1).

240898561 is an equidigital number, since it uses as much as digits as its factorization.

240898561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 240898561 is about 15520.9072221955. The cubic root of 240898561 is about 622.2211013881.

The spelling of 240898561 in words is "two hundred forty million, eight hundred ninety-eight thousand, five hundred sixty-one".