404000551 has 2 divisors, whose sum is σ = 404000552. Its totient is φ = 404000550.

The previous prime is 404000491. The next prime is 404000557. The reversal of 404000551 is 155000404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 404000551 - 2⁷ = 404000423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404000557) 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, 202000275 + 202000276.

It is an arithmetic number, because the mean of its divisors is an integer number (202000276).

Almost surely, 2^404000551 is an apocalyptic number.

404000551 is a deficient number, since it is larger than the sum of its proper divisors (1).

404000551 is an equidigital number, since it uses as much as digits as its factorization.

404000551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 404000551 is about 20099.7649488744. The cubic root of 404000551 is about 739.2545152513.

Adding to 404000551 its reverse (155000404), we get a palindrome (559000955).

The spelling of 404000551 in words is "four hundred four million, five hundred fifty-one", and thus it is an aban number.