591983981 has 2 divisors, whose sum is σ = 591983982. Its totient is φ = 591983980.

The previous prime is 591983963. The next prime is 591983999. The reversal of 591983981 is 189389195.

It is a balanced prime because it is at equal distance from previous prime (591983963) and next prime (591983999).

It can be written as a sum of positive squares in only one way, i.e., 525968356 + 66015625 = 22934^2 + 8125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-591983981 is a prime.

It is a super-2 number, since 2×591983981² = 700890067521216722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (591980981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 295991990 + 295991991.

It is an arithmetic number, because the mean of its divisors is an integer number (295991991).

Almost surely, 2^591983981 is an apocalyptic number.

It is an amenable number.

591983981 is a deficient number, since it is larger than the sum of its proper divisors (1).

591983981 is an equidigital number, since it uses as much as digits as its factorization.

591983981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 53.

The square root of 591983981 is about 24330.7209305438. The cubic root of 591983981 is about 839.6597171403.

The spelling of 591983981 in words is "five hundred ninety-one million, nine hundred eighty-three thousand, nine hundred eighty-one".