1000090009 has 2 divisors, whose sum is σ = 1000090010. Its totient is φ = 1000090008.

The previous prime is 1000089997. The next prime is 1000090031. The reversal of 1000090009 is 9000900001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 938074384 + 62015625 = 30628^2 + 7875^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000090009 - 2²¹ = 997992857 is a prime.

It is a super-2 number, since 2×1000090009² = 2000360052203240162, which contains 22 as substring.

1000090009 is a modest number, since divided by 90009 gives 10 as remainder.

It is not a weakly prime, because it can be changed into another prime (1000093009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500045004 + 500045005.

It is an arithmetic number, because the mean of its divisors is an integer number (500045005).

Almost surely, 2^1000090009 is an apocalyptic number.

It is an amenable number.

1000090009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000090009 is an equidigital number, since it uses as much as digits as its factorization.

1000090009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 1000090009 is about 31624.1997369103. The cubic root of 1000090009 is about 1000.0300020999.

The spelling of 1000090009 in words is "one billion, ninety thousand, nine".