53447621 has 2 divisors, whose sum is σ = 53447622. Its totient is φ = 53447620.

The previous prime is 53447591. The next prime is 53447623. The reversal of 53447621 is 12674435.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51638596 + 1809025 = 7186^2 + 1345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53447621 is a prime.

Together with 53447623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53447623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26723810 + 26723811.

It is an arithmetic number, because the mean of its divisors is an integer number (26723811).

Almost surely, 2^53447621 is an apocalyptic number.

It is an amenable number.

53447621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53447621 is an equidigital number, since it uses as much as digits as its factorization.

53447621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 32.

The square root of 53447621 is about 7310.7879876249. The cubic root of 53447621 is about 376.6830917560.

The spelling of 53447621 in words is "fifty-three million, four hundred forty-seven thousand, six hundred twenty-one".