53505709 has 2 divisors, whose sum is σ = 53505710. Its totient is φ = 53505708.

The previous prime is 53505707. The next prime is 53505713. The reversal of 53505709 is 90750535.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41409225 + 12096484 = 6435^2 + 3478^2 .

It is a cyclic number.

It is not a de Polignac number, because 53505709 - 2¹ = 53505707 is a prime.

Together with 53505707, 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 (53505703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26752854 + 26752855.

It is an arithmetic number, because the mean of its divisors is an integer number (26752855).

Almost surely, 2^53505709 is an apocalyptic number.

It is an amenable number.

53505709 is a deficient number, since it is larger than the sum of its proper divisors (1).

53505709 is an equidigital number, since it uses as much as digits as its factorization.

53505709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23625, while the sum is 34.

The square root of 53505709 is about 7314.7596679590. The cubic root of 53505709 is about 376.8195047212.

The spelling of 53505709 in words is "fifty-three million, five hundred five thousand, seven hundred nine".