1655009809 has 2 divisors, whose sum is σ = 1655009810. Its totient is φ = 1655009808.

The previous prime is 1655009779. The next prime is 1655009821. The reversal of 1655009809 is 9089005561.

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., 1579267600 + 75742209 = 39740^2 + 8703^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655009809 - 2¹³ = 1655001617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1655009879) 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, 827504904 + 827504905.

It is an arithmetic number, because the mean of its divisors is an integer number (827504905).

Almost surely, 2^1655009809 is an apocalyptic number.

It is an amenable number.

1655009809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655009809 is an equidigital number, since it uses as much as digits as its factorization.

1655009809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 1655009809 is about 40681.8117713555. The cubic root of 1655009809 is about 1182.8604854877.

The spelling of 1655009809 in words is "one billion, six hundred fifty-five million, nine thousand, eight hundred nine".