53509213 has 2 divisors, whose sum is σ = 53509214. Its totient is φ = 53509212.

The previous prime is 53509163. The next prime is 53509231. The reversal of 53509213 is 31290535.

Together with next prime (53509231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53392249 + 116964 = 7307^2 + 342^2 .

It is a cyclic number.

It is not a de Polignac number, because 53509213 - 2¹⁷ = 53378141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53509273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26754606 + 26754607.

It is an arithmetic number, because the mean of its divisors is an integer number (26754607).

Almost surely, 2^53509213 is an apocalyptic number.

It is an amenable number.

53509213 is a deficient number, since it is larger than the sum of its proper divisors (1).

53509213 is an equidigital number, since it uses as much as digits as its factorization.

53509213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 53509213 is about 7314.9991797676. Note that the first 3 decimals coincide. The cubic root of 53509213 is about 376.8277303027.

Adding to 53509213 its reverse (31290535), we get a palindrome (84799748).

The spelling of 53509213 in words is "fifty-three million, five hundred nine thousand, two hundred thirteen".