1646469109 has 2 divisors, whose sum is σ = 1646469110. Its totient is φ = 1646469108.

The previous prime is 1646469049. The next prime is 1646469127. The reversal of 1646469109 is 9019646461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1395246609 + 251222500 = 37353^2 + 15850^2 .

It is a cyclic number.

It is not a de Polignac number, because 1646469109 - 2¹⁹ = 1645944821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1646499109) 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, 823234554 + 823234555.

It is an arithmetic number, because the mean of its divisors is an integer number (823234555).

Almost surely, 2^1646469109 is an apocalyptic number.

It is an amenable number.

1646469109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646469109 is an equidigital number, since it uses as much as digits as its factorization.

1646469109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 1646469109 is about 40576.7064829072. The cubic root of 1646469109 is about 1180.8222529566.

It can be divided in two parts, 164646 and 9109, that added together give a triangular number (173755 = T₅₈₉).

The spelling of 1646469109 in words is "one billion, six hundred forty-six million, four hundred sixty-nine thousand, one hundred nine".