241001561 has 2 divisors, whose sum is σ = 241001562. Its totient is φ = 241001560.

The previous prime is 241001443. The next prime is 241001581. The reversal of 241001561 is 165100142.

It is an a-pointer prime, because the next prime (241001581) can be obtained adding 241001561 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174741961 + 66259600 = 13219^2 + 8140^2 .

It is a cyclic number.

It is not a de Polignac number, because 241001561 - 2²² = 236807257 is a prime.

It is not a weakly prime, because it can be changed into another prime (241001581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120500780 + 120500781.

It is an arithmetic number, because the mean of its divisors is an integer number (120500781).

Almost surely, 2^241001561 is an apocalyptic number.

It is an amenable number.

241001561 is a deficient number, since it is larger than the sum of its proper divisors (1).

241001561 is an equidigital number, since it uses as much as digits as its factorization.

241001561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 241001561 is about 15524.2249726033. The cubic root of 241001561 is about 622.3097689186.

The spelling of 241001561 in words is "two hundred forty-one million, one thousand, five hundred sixty-one".