41565721 has 2 divisors, whose sum is σ = 41565722. Its totient is φ = 41565720.

The previous prime is 41565701. The next prime is 41565737. The reversal of 41565721 is 12756514.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41024025 + 541696 = 6405^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 41565721 - 2¹¹ = 41563673 is a prime.

It is equal to p_2522992 and since 41565721 and 2522992 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (41565701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20782860 + 20782861.

It is an arithmetic number, because the mean of its divisors is an integer number (20782861).

Almost surely, 2^41565721 is an apocalyptic number.

It is an amenable number.

41565721 is a deficient number, since it is larger than the sum of its proper divisors (1).

41565721 is an equidigital number, since it uses as much as digits as its factorization.

41565721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 31.

The square root of 41565721 is about 6447.1482843192. The cubic root of 41565721 is about 346.4004435143.

The spelling of 41565721 in words is "forty-one million, five hundred sixty-five thousand, seven hundred twenty-one".