41491561 has 2 divisors, whose sum is σ = 41491562. Its totient is φ = 41491560.

The previous prime is 41491531. The next prime is 41491579. The reversal of 41491561 is 16519414.

41491561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40717161 + 774400 = 6381^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 41491561 - 2⁷ = 41491433 is a prime.

It is not a weakly prime, because it can be changed into another prime (41491531) 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, 20745780 + 20745781.

It is an arithmetic number, because the mean of its divisors is an integer number (20745781).

Almost surely, 2^41491561 is an apocalyptic number.

It is an amenable number.

41491561 is a deficient number, since it is larger than the sum of its proper divisors (1).

41491561 is an equidigital number, since it uses as much as digits as its factorization.

41491561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 41491561 is about 6441.3943366324. The cubic root of 41491561 is about 346.1943093149.

The spelling of 41491561 in words is "forty-one million, four hundred ninety-one thousand, five hundred sixty-one".