53165509 has 2 divisors, whose sum is σ = 53165510. Its totient is φ = 53165508.

The previous prime is 53165503. The next prime is 53165531. The reversal of 53165509 is 90556135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45603009 + 7562500 = 6753^2 + 2750^2 .

It is a cyclic number.

It is not a de Polignac number, because 53165509 - 2⁹ = 53164997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53165503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26582754 + 26582755.

It is an arithmetic number, because the mean of its divisors is an integer number (26582755).

Almost surely, 2^53165509 is an apocalyptic number.

It is an amenable number.

53165509 is a deficient number, since it is larger than the sum of its proper divisors (1).

53165509 is an equidigital number, since it uses as much as digits as its factorization.

53165509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20250, while the sum is 34.

The square root of 53165509 is about 7291.4682334904. The cubic root of 53165509 is about 376.0191748370.

The spelling of 53165509 in words is "fifty-three million, one hundred sixty-five thousand, five hundred nine".