1000190909 has 2 divisors, whose sum is σ = 1000190910. Its totient is φ = 1000190908.

The previous prime is 1000190897. The next prime is 1000190923. The reversal of 1000190909 is 9090910001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 564300025 + 435890884 = 23755^2 + 20878^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000190909 - 2¹² = 1000186813 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000190209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500095454 + 500095455.

It is an arithmetic number, because the mean of its divisors is an integer number (500095455).

Almost surely, 2^1000190909 is an apocalyptic number.

It is an amenable number.

1000190909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000190909 is an equidigital number, since it uses as much as digits as its factorization.

1000190909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 1000190909 is about 31625.7949939602. The cubic root of 1000190909 is about 1000.0636322842.

The spelling of 1000190909 in words is "one billion, one hundred ninety thousand, nine hundred nine".