53509231 has 2 divisors, whose sum is σ = 53509232. Its totient is φ = 53509230.

The previous prime is 53509213. The next prime is 53509237. The reversal of 53509231 is 13290535.

Together with previous prime (53509213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 53509231 - 2⁷ = 53509103 is a prime.

It is a super-2 number, since 2×53509231² = 5726475604422722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 53509231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53509237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26754615 + 26754616.

It is an arithmetic number, because the mean of its divisors is an integer number (26754616).

Almost surely, 2^53509231 is an apocalyptic number.

53509231 is a deficient number, since it is larger than the sum of its proper divisors (1).

53509231 is an equidigital number, since it uses as much as digits as its factorization.

53509231 is an odious number, because the sum of its binary digits is odd.

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

The square root of 53509231 is about 7315.0004101162. Note that the first 3 decimals coincide. The cubic root of 53509231 is about 376.8277725565.

Adding to 53509231 its reverse (13290535), we get a palindrome (66799766).

The spelling of 53509231 in words is "fifty-three million, five hundred nine thousand, two hundred thirty-one".