54551621 has 2 divisors, whose sum is σ = 54551622. Its totient is φ = 54551620.

The previous prime is 54551617. The next prime is 54551647. The reversal of 54551621 is 12615545.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49773025 + 4778596 = 7055^2 + 2186^2 .

It is a cyclic number.

It is not a de Polignac number, because 54551621 - 2² = 54551617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54551611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27275810 + 27275811.

It is an arithmetic number, because the mean of its divisors is an integer number (27275811).

Almost surely, 2^54551621 is an apocalyptic number.

It is an amenable number.

54551621 is a deficient number, since it is larger than the sum of its proper divisors (1).

54551621 is an equidigital number, since it uses as much as digits as its factorization.

54551621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6000, while the sum is 29.

The square root of 54551621 is about 7385.9069179079. The cubic root of 54551621 is about 379.2589922471.

The spelling of 54551621 in words is "fifty-four million, five hundred fifty-one thousand, six hundred twenty-one".