1642927109 has 2 divisors, whose sum is σ = 1642927110. Its totient is φ = 1642927108.

The previous prime is 1642927103. The next prime is 1642927133. The reversal of 1642927109 is 9017292461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1002988900 + 639938209 = 31670^2 + 25297^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642927109 - 2²⁴ = 1626149893 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642927103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821463554 + 821463555.

It is an arithmetic number, because the mean of its divisors is an integer number (821463555).

Almost surely, 2^1642927109 is an apocalyptic number.

It is an amenable number.

1642927109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642927109 is an equidigital number, since it uses as much as digits as its factorization.

1642927109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 1642927109 is about 40533.0372535787. The cubic root of 1642927109 is about 1179.9748891046.

The spelling of 1642927109 in words is "one billion, six hundred forty-two million, nine hundred twenty-seven thousand, one hundred nine".