41591821 has 2 divisors, whose sum is σ = 41591822. Its totient is φ = 41591820.

The previous prime is 41591819. The next prime is 41591833. The reversal of 41591821 is 12819514.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25100100 + 16491721 = 5010^2 + 4061^2 .

It is a cyclic number.

It is not a de Polignac number, because 41591821 - 2¹ = 41591819 is a prime.

Together with 41591819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41591861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20795910 + 20795911.

It is an arithmetic number, because the mean of its divisors is an integer number (20795911).

Almost surely, 2^41591821 is an apocalyptic number.

It is an amenable number.

41591821 is a deficient number, since it is larger than the sum of its proper divisors (1).

41591821 is an equidigital number, since it uses as much as digits as its factorization.

41591821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 31.

The square root of 41591821 is about 6449.1721174117. The cubic root of 41591821 is about 346.4729324119.

The spelling of 41591821 in words is "forty-one million, five hundred ninety-one thousand, eight hundred twenty-one".