2018642309 has 2 divisors, whose sum is σ = 2018642310. Its totient is φ = 2018642308.

The previous prime is 2018642303. The next prime is 2018642341. The reversal of 2018642309 is 9032468102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1607769409 + 410872900 = 40097^2 + 20270^2 .

It is a cyclic number.

It is not a de Polignac number, because 2018642309 - 2⁴ = 2018642293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2018642303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1009321154 + 1009321155.

It is an arithmetic number, because the mean of its divisors is an integer number (1009321155).

Almost surely, 2^2018642309 is an apocalyptic number.

It is an amenable number.

2018642309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2018642309 is an equidigital number, since it uses as much as digits as its factorization.

2018642309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 2018642309 is about 44929.3034555400. The cubic root of 2018642309 is about 1263.8235890923.

The spelling of 2018642309 in words is "two billion, eighteen million, six hundred forty-two thousand, three hundred nine".