406405081 has 2 divisors, whose sum is σ = 406405082. Its totient is φ = 406405080.

The previous prime is 406405037. The next prime is 406405091. The reversal of 406405081 is 180504604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397643481 + 8761600 = 19941^2 + 2960^2 .

It is a cyclic number.

It is not a de Polignac number, because 406405081 - 2⁹ = 406404569 is a prime.

It is a super-2 number, since 2×406405081² = 330330179725233122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (406405031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203202540 + 203202541.

It is an arithmetic number, because the mean of its divisors is an integer number (203202541).

Almost surely, 2^406405081 is an apocalyptic number.

It is an amenable number.

406405081 is a deficient number, since it is larger than the sum of its proper divisors (1).

406405081 is an equidigital number, since it uses as much as digits as its factorization.

406405081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 406405081 is about 20159.4910898068. The cubic root of 406405081 is about 740.7182465182.

Adding to 406405081 its reverse (180504604), we get a palindrome (586909685).

The spelling of 406405081 in words is "four hundred six million, four hundred five thousand, eighty-one".