2109431869 has 2 divisors, whose sum is σ = 2109431870. Its totient is φ = 2109431868.

The previous prime is 2109431801. The next prime is 2109431873. The reversal of 2109431869 is 9681349012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2094892900 + 14538969 = 45770^2 + 3813^2 .

It is a cyclic number.

It is not a de Polignac number, because 2109431869 - 2⁷ = 2109431741 is a prime.

It is a super-2 number, since 2×2109431869² = 8899405619905666322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2109431879) 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, 1054715934 + 1054715935.

It is an arithmetic number, because the mean of its divisors is an integer number (1054715935).

Almost surely, 2^2109431869 is an apocalyptic number.

It is an amenable number.

2109431869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109431869 is an equidigital number, since it uses as much as digits as its factorization.

2109431869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 2109431869 is about 45928.5517842660. The cubic root of 2109431869 is about 1282.4934851925.

The spelling of 2109431869 in words is "two billion, one hundred nine million, four hundred thirty-one thousand, eight hundred sixty-nine".