53555521 has 2 divisors, whose sum is σ = 53555522. Its totient is φ = 53555520.

The previous prime is 53555503. The next prime is 53555527. The reversal of 53555521 is 12555535.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52200625 + 1354896 = 7225^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 53555521 - 2⁹ = 53555009 is a prime.

It is not a weakly prime, because it can be changed into another prime (53555527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26777760 + 26777761.

It is an arithmetic number, because the mean of its divisors is an integer number (26777761).

Almost surely, 2^53555521 is an apocalyptic number.

It is an amenable number.

53555521 is a deficient number, since it is larger than the sum of its proper divisors (1).

53555521 is an equidigital number, since it uses as much as digits as its factorization.

53555521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18750, while the sum is 31.

The square root of 53555521 is about 7318.1637724227. The cubic root of 53555521 is about 376.9364038443.

The spelling of 53555521 in words is "fifty-three million, five hundred fifty-five thousand, five hundred twenty-one".