431520409 has 2 divisors, whose sum is σ = 431520410. Its totient is φ = 431520408.

The previous prime is 431520391. The next prime is 431520421. The reversal of 431520409 is 904025134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 291453184 + 140067225 = 17072^2 + 11835^2 .

It is a cyclic number.

It is not a de Polignac number, because 431520409 - 2⁷ = 431520281 is a prime.

It is a super-3 number, since 3×431520409³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (431520499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215760204 + 215760205.

It is an arithmetic number, because the mean of its divisors is an integer number (215760205).

Almost surely, 2^431520409 is an apocalyptic number.

It is an amenable number.

431520409 is a deficient number, since it is larger than the sum of its proper divisors (1).

431520409 is an equidigital number, since it uses as much as digits as its factorization.

431520409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 431520409 is about 20773.0693206372. The cubic root of 431520409 is about 755.6727824653.

The spelling of 431520409 in words is "four hundred thirty-one million, five hundred twenty thousand, four hundred nine".