53605621 has 2 divisors, whose sum is σ = 53605622. Its totient is φ = 53605620.

The previous prime is 53605619. The next prime is 53605681. The reversal of 53605621 is 12650635.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53129521 + 476100 = 7289^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 53605621 - 2¹ = 53605619 is a prime.

Together with 53605619, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 53605621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53605681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26802810 + 26802811.

It is an arithmetic number, because the mean of its divisors is an integer number (26802811).

Almost surely, 2^53605621 is an apocalyptic number.

It is an amenable number.

53605621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53605621 is an equidigital number, since it uses as much as digits as its factorization.

53605621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 53605621 is about 7321.5859620713. The cubic root of 53605621 is about 377.0539057555.

The spelling of 53605621 in words is "fifty-three million, six hundred five thousand, six hundred twenty-one".