41661649 has 2 divisors, whose sum is σ = 41661650. Its totient is φ = 41661648.

The previous prime is 41661647. The next prime is 41661673. The reversal of 41661649 is 94616614.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37601424 + 4060225 = 6132^2 + 2015^2 .

It is a cyclic number.

It is not a de Polignac number, because 41661649 - 2¹ = 41661647 is a prime.

Together with 41661647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (41661647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20830824 + 20830825.

It is an arithmetic number, because the mean of its divisors is an integer number (20830825).

Almost surely, 2^41661649 is an apocalyptic number.

It is an amenable number.

41661649 is a deficient number, since it is larger than the sum of its proper divisors (1).

41661649 is an equidigital number, since it uses as much as digits as its factorization.

41661649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 41661649 is about 6454.5835651884. The cubic root of 41661649 is about 346.6667203936. Note that the first 3 decimals are identical.

The spelling of 41661649 in words is "forty-one million, six hundred sixty-one thousand, six hundred forty-nine".