53390621 has 2 divisors, whose sum is σ = 53390622. Its totient is φ = 53390620.

The previous prime is 53390549. The next prime is 53390629. The reversal of 53390621 is 12609335.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41925625 + 11464996 = 6475^2 + 3386^2 .

It is a cyclic number.

It is not a de Polignac number, because 53390621 - 2¹⁸ = 53128477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53390629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26695310 + 26695311.

It is an arithmetic number, because the mean of its divisors is an integer number (26695311).

Almost surely, 2^53390621 is an apocalyptic number.

It is an amenable number.

53390621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53390621 is an equidigital number, since it uses as much as digits as its factorization.

53390621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 53390621 is about 7306.8885991234. Note that the first 3 decimals coincide. The cubic root of 53390621 is about 376.5491377214.

Adding to 53390621 its reverse (12609335), we get a palindrome (65999956).

The spelling of 53390621 in words is "fifty-three million, three hundred ninety thousand, six hundred twenty-one".