405241609 has 2 divisors, whose sum is σ = 405241610. Its totient is φ = 405241608.

The previous prime is 405241553. The next prime is 405241637. The reversal of 405241609 is 906142504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 360886009 + 44355600 = 18997^2 + 6660^2 .

It is a cyclic number.

It is not a de Polignac number, because 405241609 - 2¹⁵ = 405208841 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (405241009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202620804 + 202620805.

It is an arithmetic number, because the mean of its divisors is an integer number (202620805).

Almost surely, 2^405241609 is an apocalyptic number.

It is an amenable number.

405241609 is a deficient number, since it is larger than the sum of its proper divisors (1).

405241609 is an equidigital number, since it uses as much as digits as its factorization.

405241609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 405241609 is about 20130.6137263621. The cubic root of 405241609 is about 740.0107187393.

The spelling of 405241609 in words is "four hundred five million, two hundred forty-one thousand, six hundred nine".