53909509 has 2 divisors, whose sum is σ = 53909510. Its totient is φ = 53909508.

The previous prime is 53909503. The next prime is 53909563. The reversal of 53909509 is 90590935.

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., 49308484 + 4601025 = 7022^2 + 2145^2 .

It is a cyclic number.

It is not a de Polignac number, because 53909509 - 2⁷ = 53909381 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 (53909503) 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, 26954754 + 26954755.

It is an arithmetic number, because the mean of its divisors is an integer number (26954755).

Almost surely, 2^53909509 is an apocalyptic number.

It is an amenable number.

53909509 is a deficient number, since it is larger than the sum of its proper divisors (1).

53909509 is an equidigital number, since it uses as much as digits as its factorization.

53909509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54675, while the sum is 40.

The square root of 53909509 is about 7342.3095140426. The cubic root of 53909509 is about 377.7650644863.

The spelling of 53909509 in words is "fifty-three million, nine hundred nine thousand, five hundred nine".