405221041 has 2 divisors, whose sum is σ = 405221042. Its totient is φ = 405221040.

The previous prime is 405221039. The next prime is 405221053. The reversal of 405221041 is 140122504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 357210000 + 48011041 = 18900^2 + 6929^2 .

It is a cyclic number.

It is not a de Polignac number, because 405221041 - 2¹ = 405221039 is a prime.

Together with 405221039, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (405221441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202610520 + 202610521.

It is an arithmetic number, because the mean of its divisors is an integer number (202610521).

Almost surely, 2^405221041 is an apocalyptic number.

It is an amenable number.

405221041 is a deficient number, since it is larger than the sum of its proper divisors (1).

405221041 is an equidigital number, since it uses as much as digits as its factorization.

405221041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 405221041 is about 20130.1028561704. The cubic root of 405221041 is about 739.9981988025.

Adding to 405221041 its reverse (140122504), we get a palindrome (545343545).

The spelling of 405221041 in words is "four hundred five million, two hundred twenty-one thousand, forty-one".