431380909 has 2 divisors, whose sum is σ = 431380910. Its totient is φ = 431380908.

The previous prime is 431380897. The next prime is 431380913. The reversal of 431380909 is 909083134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361190025 + 70190884 = 19005^2 + 8378^2 .

It is a cyclic number.

It is not a de Polignac number, because 431380909 - 2¹¹ = 431378861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (441380909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215690454 + 215690455.

It is an arithmetic number, because the mean of its divisors is an integer number (215690455).

Almost surely, 2^431380909 is an apocalyptic number.

It is an amenable number.

431380909 is a deficient number, since it is larger than the sum of its proper divisors (1).

431380909 is an equidigital number, since it uses as much as digits as its factorization.

431380909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 431380909 is about 20769.7113364630. The cubic root of 431380909 is about 755.5913435094.

The spelling of 431380909 in words is "four hundred thirty-one million, three hundred eighty thousand, nine hundred nine".