1930997009 has 2 divisors, whose sum is σ = 1930997010. Its totient is φ = 1930997008.

The previous prime is 1930996981. The next prime is 1930997023. The reversal of 1930997009 is 9007990391.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1302993409 + 628003600 = 36097^2 + 25060^2 .

It is an emirp because it is prime and its reverse (9007990391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1930997009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1930997069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965498504 + 965498505.

It is an arithmetic number, because the mean of its divisors is an integer number (965498505).

Almost surely, 2^1930997009 is an apocalyptic number.

It is an amenable number.

1930997009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1930997009 is an equidigital number, since it uses as much as digits as its factorization.

1930997009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 137781, while the sum is 47.

The square root of 1930997009 is about 43943.1110528146. Note that the first 3 decimals coincide. The cubic root of 1930997009 is about 1245.2614213165.

The spelling of 1930997009 in words is "one billion, nine hundred thirty million, nine hundred ninety-seven thousand, nine".