53645509 has 2 divisors, whose sum is σ = 53645510. Its totient is φ = 53645508.

The previous prime is 53645479. The next prime is 53645519. The reversal of 53645509 is 90554635.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35820225 + 17825284 = 5985^2 + 4222^2 .

It is a cyclic number.

It is not a de Polignac number, because 53645509 - 2¹³ = 53637317 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53645519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26822754 + 26822755.

It is an arithmetic number, because the mean of its divisors is an integer number (26822755).

Almost surely, 2^53645509 is an apocalyptic number.

It is an amenable number.

53645509 is a deficient number, since it is larger than the sum of its proper divisors (1).

53645509 is an equidigital number, since it uses as much as digits as its factorization.

53645509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 53645509 is about 7324.3094555050. The cubic root of 53645509 is about 377.1474046401.

The spelling of 53645509 in words is "fifty-three million, six hundred forty-five thousand, five hundred nine".