431005409 has 2 divisors, whose sum is σ = 431005410. Its totient is φ = 431005408.

The previous prime is 431005397. The next prime is 431005417. The reversal of 431005409 is 904500134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 387971809 + 43033600 = 19697^2 + 6560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431005409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (431005459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215502704 + 215502705.

It is an arithmetic number, because the mean of its divisors is an integer number (215502705).

Almost surely, 2^431005409 is an apocalyptic number.

It is an amenable number.

431005409 is a deficient number, since it is larger than the sum of its proper divisors (1).

431005409 is an equidigital number, since it uses as much as digits as its factorization.

431005409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 431005409 is about 20760.6697627991. The cubic root of 431005409 is about 755.3720424176.

The spelling of 431005409 in words is "four hundred thirty-one million, five thousand, four hundred nine".