431809109 has 2 divisors, whose sum is σ = 431809110. Its totient is φ = 431809108.

The previous prime is 431809031. The next prime is 431809117. The reversal of 431809109 is 901908134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 306145009 + 125664100 = 17497^2 + 11210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431809109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431889109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215904554 + 215904555.

It is an arithmetic number, because the mean of its divisors is an integer number (215904555).

Almost surely, 2^431809109 is an apocalyptic number.

It is an amenable number.

431809109 is a deficient number, since it is larger than the sum of its proper divisors (1).

431809109 is an equidigital number, since it uses as much as digits as its factorization.

431809109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 431809109 is about 20780.0170596658. The cubic root of 431809109 is about 755.8412674264.

The spelling of 431809109 in words is "four hundred thirty-one million, eight hundred nine thousand, one hundred nine".