53455621 has 2 divisors, whose sum is σ = 53455622. Its totient is φ = 53455620.

The previous prime is 53455609. The next prime is 53455631. The reversal of 53455621 is 12655435.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53450721 + 4900 = 7311^2 + 70^2 .

It is a cyclic number.

It is not a de Polignac number, because 53455621 - 2⁹ = 53455109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53455631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26727810 + 26727811.

It is an arithmetic number, because the mean of its divisors is an integer number (26727811).

Almost surely, 2^53455621 is an apocalyptic number.

It is an amenable number.

53455621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53455621 is an equidigital number, since it uses as much as digits as its factorization.

53455621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 31.

The square root of 53455621 is about 7311.3351037960. The cubic root of 53455621 is about 376.7018846997.

The spelling of 53455621 in words is "fifty-three million, four hundred fifty-five thousand, six hundred twenty-one".