1001992109 has 2 divisors, whose sum is σ = 1001992110. Its totient is φ = 1001992108.

The previous prime is 1001992099. The next prime is 1001992111. The reversal of 1001992109 is 9012991001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 980629225 + 21362884 = 31315^2 + 4622^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001992109 - 2¹⁶ = 1001926573 is a prime.

Together with 1001992111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001992129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500996054 + 500996055.

It is an arithmetic number, because the mean of its divisors is an integer number (500996055).

Almost surely, 2^1001992109 is an apocalyptic number.

It is an amenable number.

1001992109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001992109 is an equidigital number, since it uses as much as digits as its factorization.

1001992109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 1001992109 is about 31654.2589393592. The cubic root of 1001992109 is about 1000.6635958764.

The spelling of 1001992109 in words is "one billion, one million, nine hundred ninety-two thousand, one hundred nine".