1931983409 has 2 divisors, whose sum is σ = 1931983410. Its totient is φ = 1931983408.

The previous prime is 1931983367. The next prime is 1931983433. The reversal of 1931983409 is 9043891391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1624331809 + 307651600 = 40303^2 + 17540^2 .

It is an emirp because it is prime and its reverse (9043891391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1931983409 is a prime.

It is a super-2 number, since 2×1931983409² = 7465119785302522562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1931985409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965991704 + 965991705.

It is an arithmetic number, because the mean of its divisors is an integer number (965991705).

Almost surely, 2^1931983409 is an apocalyptic number.

It is an amenable number.

1931983409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1931983409 is an equidigital number, since it uses as much as digits as its factorization.

1931983409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 1931983409 is about 43954.3332221068. Note that the first 3 decimals coincide. The cubic root of 1931983409 is about 1245.4734217782.

The spelling of 1931983409 in words is "one billion, nine hundred thirty-one million, nine hundred eighty-three thousand, four hundred nine".