1005220609 has 2 divisors, whose sum is σ = 1005220610. Its totient is φ = 1005220608.

The previous prime is 1005220597. The next prime is 1005220633. The reversal of 1005220609 is 9060225001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 569872384 + 435348225 = 23872^2 + 20865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1005220609 - 2⁵ = 1005220577 is a prime.

It is not a weakly prime, because it can be changed into another prime (1005220639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502610304 + 502610305.

It is an arithmetic number, because the mean of its divisors is an integer number (502610305).

Almost surely, 2^1005220609 is an apocalyptic number.

It is an amenable number.

1005220609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005220609 is an equidigital number, since it uses as much as digits as its factorization.

1005220609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1005220609 is about 31705.2142241619. The cubic root of 1005220609 is about 1001.7371834462.

The spelling of 1005220609 in words is "one billion, five million, two hundred twenty thousand, six hundred nine".