1930305809 has 2 divisors, whose sum is σ = 1930305810. Its totient is φ = 1930305808.

The previous prime is 1930305763. The next prime is 1930305823. The reversal of 1930305809 is 9085030391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1656734209 + 273571600 = 40703^2 + 16540^2 .

It is an emirp because it is prime and its reverse (9085030391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1930305809 - 2²⁰ = 1929257233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1930301809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965152904 + 965152905.

It is an arithmetic number, because the mean of its divisors is an integer number (965152905).

Almost surely, 2^1930305809 is an apocalyptic number.

It is an amenable number.

1930305809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1930305809 is an equidigital number, since it uses as much as digits as its factorization.

1930305809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 1930305809 is about 43935.2456349114. The cubic root of 1930305809 is about 1245.1128232245.

The spelling of 1930305809 in words is "one billion, nine hundred thirty million, three hundred five thousand, eight hundred nine".