53205709 has 2 divisors, whose sum is σ = 53205710. Its totient is φ = 53205708.

The previous prime is 53205707. The next prime is 53205769. The reversal of 53205709 is 90750235.

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., 51883209 + 1322500 = 7203^2 + 1150^2 .

It is a cyclic number.

It is not a de Polignac number, because 53205709 - 2¹ = 53205707 is a prime.

Together with 53205707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53205707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26602854 + 26602855.

It is an arithmetic number, because the mean of its divisors is an integer number (26602855).

Almost surely, 2^53205709 is an apocalyptic number.

It is an amenable number.

53205709 is a deficient number, since it is larger than the sum of its proper divisors (1).

53205709 is an equidigital number, since it uses as much as digits as its factorization.

53205709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 31.

The square root of 53205709 is about 7294.2243590391. The cubic root of 53205709 is about 376.1139240007.

The spelling of 53205709 in words is "fifty-three million, two hundred five thousand, seven hundred nine".