1983808517 has 2 divisors, whose sum is σ = 1983808518. Its totient is φ = 1983808516.

The previous prime is 1983808459. The next prime is 1983808529. The reversal of 1983808517 is 7158083891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1931954116 + 51854401 = 43954^2 + 7201^2 .

It is a cyclic number.

It is not a de Polignac number, because 1983808517 - 2⁸ = 1983808261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1983808117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991904258 + 991904259.

It is an arithmetic number, because the mean of its divisors is an integer number (991904259).

Almost surely, 2^1983808517 is an apocalyptic number.

It is an amenable number.

1983808517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1983808517 is an equidigital number, since it uses as much as digits as its factorization.

1983808517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 50.

The square root of 1983808517 is about 44539.9653906466. The cubic root of 1983808517 is about 1256.5118348582.

The spelling of 1983808517 in words is "one billion, nine hundred eighty-three million, eight hundred eight thousand, five hundred seventeen".