53983981 has 2 divisors, whose sum is σ = 53983982. Its totient is φ = 53983980.

The previous prime is 53983957. The next prime is 53983987. The reversal of 53983981 is 18938935.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53421481 + 562500 = 7309^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 53983981 - 2⁵ = 53983949 is a prime.

It is a super-3 number, since 3×53983981³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53983987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26991990 + 26991991.

It is an arithmetic number, because the mean of its divisors is an integer number (26991991).

Almost surely, 2^53983981 is an apocalyptic number.

It is an amenable number.

53983981 is a deficient number, since it is larger than the sum of its proper divisors (1).

53983981 is an equidigital number, since it uses as much as digits as its factorization.

53983981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 46.

The square root of 53983981 is about 7347.3791926101. The cubic root of 53983981 is about 377.9389359475.

The spelling of 53983981 in words is "fifty-three million, nine hundred eighty-three thousand, nine hundred eighty-one".