53765981 has 2 divisors, whose sum is σ = 53765982. Its totient is φ = 53765980.

The previous prime is 53765963. The next prime is 53765993. The reversal of 53765981 is 18956735.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43099225 + 10666756 = 6565^2 + 3266^2 .

It is a cyclic number.

It is not a de Polignac number, because 53765981 - 2¹⁰ = 53764957 is a prime.

It is a super-2 number, since 2×53765981² = 5781561425784722, 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 (53765911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26882990 + 26882991.

It is an arithmetic number, because the mean of its divisors is an integer number (26882991).

Almost surely, 2^53765981 is an apocalyptic number.

It is an amenable number.

53765981 is a deficient number, since it is larger than the sum of its proper divisors (1).

53765981 is an equidigital number, since it uses as much as digits as its factorization.

53765981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 44.

The square root of 53765981 is about 7332.5289634614. The cubic root of 53765981 is about 377.4295141998.

The spelling of 53765981 in words is "fifty-three million, seven hundred sixty-five thousand, nine hundred eighty-one".