405054509 has 2 divisors, whose sum is σ = 405054510. Its totient is φ = 405054508.

The previous prime is 405054497. The next prime is 405054523. The reversal of 405054509 is 905450504.

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., 402002500 + 3052009 = 20050^2 + 1747^2 .

It is a cyclic number.

It is not a de Polignac number, because 405054509 - 2⁴ = 405054493 is a prime.

It is a super-2 number, since 2×405054509² = 328138310522462162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405054809) 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 as a sum of consecutive naturals, namely, 202527254 + 202527255.

It is an arithmetic number, because the mean of its divisors is an integer number (202527255).

Almost surely, 2^405054509 is an apocalyptic number.

It is an amenable number.

405054509 is a deficient number, since it is larger than the sum of its proper divisors (1).

405054509 is an equidigital number, since it uses as much as digits as its factorization.

405054509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 405054509 is about 20125.9660389259. The cubic root of 405054509 is about 739.8968135889.

The spelling of 405054509 in words is "four hundred five million, fifty-four thousand, five hundred nine".