404351561 has 2 divisors, whose sum is σ = 404351562. Its totient is φ = 404351560.

The previous prime is 404351557. The next prime is 404351573. The reversal of 404351561 is 165153404.

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., 325585936 + 78765625 = 18044^2 + 8875^2 .

It is a cyclic number.

It is not a de Polignac number, because 404351561 - 2² = 404351557 is a prime.

It is not a weakly prime, because it can be changed into another prime (404351551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202175780 + 202175781.

It is an arithmetic number, because the mean of its divisors is an integer number (202175781).

Almost surely, 2^404351561 is an apocalyptic number.

It is an amenable number.

404351561 is a deficient number, since it is larger than the sum of its proper divisors (1).

404351561 is an equidigital number, since it uses as much as digits as its factorization.

404351561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 404351561 is about 20108.4947472455. The cubic root of 404351561 is about 739.4685501191.

The spelling of 404351561 in words is "four hundred four million, three hundred fifty-one thousand, five hundred sixty-one".