406202561 has 4 divisors (see below), whose sum is σ = 409929300. Its totient is φ = 402475824.

The previous prime is 406202543. The next prime is 406202591. The reversal of 406202561 is 165202604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157351936 + 248850625 = 12544^2 + 15775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406202561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 406202561.

It is not an unprimeable number, because it can be changed into a prime (406202591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1863206 + ... + 1863423.

It is an arithmetic number, because the mean of its divisors is an integer number (102482325).

Almost surely, 2^406202561 is an apocalyptic number.

It is an amenable number.

406202561 is a deficient number, since it is larger than the sum of its proper divisors (3726739).

406202561 is a wasteful number, since it uses less digits than its factorization.

406202561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3726738.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 406202561 is about 20154.4675196344. The cubic root of 406202561 is about 740.5951877025.

The spelling of 406202561 in words is "four hundred six million, two hundred two thousand, five hundred sixty-one".