41557721 has 2 divisors, whose sum is σ = 41557722. Its totient is φ = 41557720.

The previous prime is 41557709. The next prime is 41557727. The reversal of 41557721 is 12775514.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24010000 + 17547721 = 4900^2 + 4189^2 .

It is a cyclic number.

It is not a de Polignac number, because 41557721 - 2⁶ = 41557657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (41557727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20778860 + 20778861.

It is an arithmetic number, because the mean of its divisors is an integer number (20778861).

Almost surely, 2^41557721 is an apocalyptic number.

It is an amenable number.

41557721 is a deficient number, since it is larger than the sum of its proper divisors (1).

41557721 is an equidigital number, since it uses as much as digits as its factorization.

41557721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9800, while the sum is 32.

The square root of 41557721 is about 6446.5278251164. The cubic root of 41557721 is about 346.3782186193.

The spelling of 41557721 in words is "forty-one million, five hundred fifty-seven thousand, seven hundred twenty-one".