53728981 has 2 divisors, whose sum is σ = 53728982. Its totient is φ = 53728980.

The previous prime is 53728937. The next prime is 53729003. The reversal of 53728981 is 18982735.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53728900 + 81 = 7330^2 + 9^2 .

It is a cyclic number.

It is not a de Polignac number, because 53728981 - 2⁷ = 53728853 is a prime.

It is a super-2 number, since 2×53728981² = 5773606798596722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53728481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26864490 + 26864491.

It is an arithmetic number, because the mean of its divisors is an integer number (26864491).

Almost surely, 2^53728981 is an apocalyptic number.

It is an amenable number.

53728981 is a deficient number, since it is larger than the sum of its proper divisors (1).

53728981 is an equidigital number, since it uses as much as digits as its factorization.

53728981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 53728981 is about 7330.0055252367. The cubic root of 53728981 is about 377.3429160921.

It can be divided in two parts, 537289 and 81, that multiplied together give a square (43520409 = 6597²).

The spelling of 53728981 in words is "fifty-three million, seven hundred twenty-eight thousand, nine hundred eighty-one".