405532609 has 2 divisors, whose sum is σ = 405532610. Its totient is φ = 405532608.

The previous prime is 405532601. The next prime is 405532643. The reversal of 405532609 is 906235504.

It is an a-pointer prime, because the next prime (405532643) can be obtained adding 405532609 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277955584 + 127577025 = 16672^2 + 11295^2 .

It is a cyclic number.

It is not a de Polignac number, because 405532609 - 2³ = 405532601 is a prime.

It is equal to p_21615478 and since 405532609 and 21615478 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (405532601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202766304 + 202766305.

It is an arithmetic number, because the mean of its divisors is an integer number (202766305).

Almost surely, 2^405532609 is an apocalyptic number.

It is an amenable number.

405532609 is a deficient number, since it is larger than the sum of its proper divisors (1).

405532609 is an equidigital number, since it uses as much as digits as its factorization.

405532609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 405532609 is about 20137.8402267969. The cubic root of 405532609 is about 740.1878078220.

The spelling of 405532609 in words is "four hundred five million, five hundred thirty-two thousand, six hundred nine".