2002178609 has 2 divisors, whose sum is σ = 2002178610. Its totient is φ = 2002178608.

The previous prime is 2002178597. The next prime is 2002178627. The reversal of 2002178609 is 9068712002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1771989025 + 230189584 = 42095^2 + 15172^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002178609 - 2⁴ = 2002178593 is a prime.

It is not a weakly prime, because it can be changed into another prime (2002178639) 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, 1001089304 + 1001089305.

It is an arithmetic number, because the mean of its divisors is an integer number (1001089305).

Almost surely, 2^2002178609 is an apocalyptic number.

It is an amenable number.

2002178609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002178609 is an equidigital number, since it uses as much as digits as its factorization.

2002178609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 2002178609 is about 44745.7105095002. The cubic root of 2002178609 is about 1260.3783631070.

The spelling of 2002178609 in words is "two billion, two million, one hundred seventy-eight thousand, six hundred nine".