53408521 has 2 divisors, whose sum is σ = 53408522. Its totient is φ = 53408520.

The previous prime is 53408419. The next prime is 53408539. The reversal of 53408521 is 12580435.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41409225 + 11999296 = 6435^2 + 3464^2 .

It is a cyclic number.

It is not a de Polignac number, because 53408521 - 2¹³ = 53400329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 53408521.

It is not a weakly prime, because it can be changed into another prime (53408561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26704260 + 26704261.

It is an arithmetic number, because the mean of its divisors is an integer number (26704261).

Almost surely, 2^53408521 is an apocalyptic number.

It is an amenable number.

53408521 is a deficient number, since it is larger than the sum of its proper divisors (1).

53408521 is an equidigital number, since it uses as much as digits as its factorization.

53408521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 53408521 is about 7308.1133680315. The cubic root of 53408521 is about 376.5912142529.

Adding to 53408521 its reverse (12580435), we get a palindrome (65988956).

It can be divided in two parts, 5340 and 8521, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 53408521 in words is "fifty-three million, four hundred eight thousand, five hundred twenty-one".