406561849 has 2 divisors, whose sum is σ = 406561850. Its totient is φ = 406561848.

The previous prime is 406561811. The next prime is 406561853. The reversal of 406561849 is 948165604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401721849 + 4840000 = 20043^2 + 2200^2 .

It is a cyclic number.

It is not a de Polignac number, because 406561849 - 2⁷ = 406561721 is a prime.

It is not a weakly prime, because it can be changed into another prime (406561049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203280924 + 203280925.

It is an arithmetic number, because the mean of its divisors is an integer number (203280925).

Almost surely, 2^406561849 is an apocalyptic number.

It is an amenable number.

406561849 is a deficient number, since it is larger than the sum of its proper divisors (1).

406561849 is an equidigital number, since it uses as much as digits as its factorization.

406561849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 406561849 is about 20163.3789083080. The cubic root of 406561849 is about 740.8134766189.

The spelling of 406561849 in words is "four hundred six million, five hundred sixty-one thousand, eight hundred forty-nine".