1018220609 has 16 divisors (see below), whose sum is σ = 1205487360. Its totient is φ = 841885440.

The previous prime is 1018220591. The next prime is 1018220617. The reversal of 1018220609 is 9060228101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1018220609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1018220629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5612 + ... + 45474.

It is an arithmetic number, because the mean of its divisors is an integer number (75342960).

Almost surely, 2^1018220609 is an apocalyptic number.

It is an amenable number.

1018220609 is a deficient number, since it is larger than the sum of its proper divisors (187266751).

1018220609 is an equidigital number, since it uses as much as digits as its factorization.

1018220609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40000.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1018220609 is about 31909.5692387096. The cubic root of 1018220609 is about 1006.0370174132.

The spelling of 1018220609 in words is "one billion, eighteen million, two hundred twenty thousand, six hundred nine".