53985509 has 2 divisors, whose sum is σ = 53985510. Its totient is φ = 53985508.

The previous prime is 53985473. The next prime is 53985551. The reversal of 53985509 is 90558935.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40132225 + 13853284 = 6335^2 + 3722^2 .

It is a cyclic number.

It is not a de Polignac number, because 53985509 - 2²⁴ = 37208293 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 53985509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53985599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26992754 + 26992755.

It is an arithmetic number, because the mean of its divisors is an integer number (26992755).

Almost surely, 2^53985509 is an apocalyptic number.

It is an amenable number.

53985509 is a deficient number, since it is larger than the sum of its proper divisors (1).

53985509 is an equidigital number, since it uses as much as digits as its factorization.

53985509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243000, while the sum is 44.

The square root of 53985509 is about 7347.4831745299. The cubic root of 53985509 is about 377.9425017290.

The spelling of 53985509 in words is "fifty-three million, nine hundred eighty-five thousand, five hundred nine".