53516621 has 2 divisors, whose sum is σ = 53516622. Its totient is φ = 53516620.

The previous prime is 53516609. The next prime is 53516647. The reversal of 53516621 is 12661535.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53509225 + 7396 = 7315^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 53516621 - 2⁶ = 53516557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53516821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26758310 + 26758311.

It is an arithmetic number, because the mean of its divisors is an integer number (26758311).

Almost surely, 2^53516621 is an apocalyptic number.

It is an amenable number.

53516621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53516621 is an equidigital number, since it uses as much as digits as its factorization.

53516621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

The square root of 53516621 is about 7315.5055191012. The cubic root of 53516621 is about 376.8451192772.

The spelling of 53516621 in words is "fifty-three million, five hundred sixteen thousand, six hundred twenty-one".