431140021909 has 2 divisors, whose sum is σ = 431140021910. Its totient is φ = 431140021908.

The previous prime is 431140021877. The next prime is 431140021951. The reversal of 431140021909 is 909120041134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 398198860900 + 32941161009 = 631030^2 + 181497^2 .

It is a cyclic number.

It is not a de Polignac number, because 431140021909 - 2⁵ = 431140021877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431140021969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215570010954 + 215570010955.

It is an arithmetic number, because the mean of its divisors is an integer number (215570010955).

Almost surely, 2^431140021909 is an apocalyptic number.

It is an amenable number.

431140021909 is a deficient number, since it is larger than the sum of its proper divisors (1).

431140021909 is an equidigital number, since it uses as much as digits as its factorization.

431140021909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 431140021909 in words is "four hundred thirty-one billion, one hundred forty million, twenty-one thousand, nine hundred nine".