53430521 has 2 divisors, whose sum is σ = 53430522. Its totient is φ = 53430520.

The previous prime is 53430497. The next prime is 53430547. The reversal of 53430521 is 12503435.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40005625 + 13424896 = 6325^2 + 3664^2 .

It is a cyclic number.

It is not a de Polignac number, because 53430521 - 2¹⁸ = 53168377 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (53430121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26715260 + 26715261.

It is an arithmetic number, because the mean of its divisors is an integer number (26715261).

Almost surely, 2^53430521 is an apocalyptic number.

It is an amenable number.

53430521 is a deficient number, since it is larger than the sum of its proper divisors (1).

53430521 is an equidigital number, since it uses as much as digits as its factorization.

53430521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 53430521 is about 7309.6183894920. The cubic root of 53430521 is about 376.6429155497.

Adding to 53430521 its reverse (12503435), we get a palindrome (65933956).

The spelling of 53430521 in words is "fifty-three million, four hundred thirty thousand, five hundred twenty-one".