55441721 has 2 divisors, whose sum is σ = 55441722. Its totient is φ = 55441720.

The previous prime is 55441697. The next prime is 55441751. The reversal of 55441721 is 12714455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52417600 + 3024121 = 7240^2 + 1739^2 .

It is a cyclic number.

It is not a de Polignac number, because 55441721 - 2¹⁸ = 55179577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55441751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27720860 + 27720861.

It is an arithmetic number, because the mean of its divisors is an integer number (27720861).

Almost surely, 2^55441721 is an apocalyptic number.

It is an amenable number.

55441721 is a deficient number, since it is larger than the sum of its proper divisors (1).

55441721 is an equidigital number, since it uses as much as digits as its factorization.

55441721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 29.

The square root of 55441721 is about 7445.9197551411. The cubic root of 55441721 is about 381.3106199048.

The spelling of 55441721 in words is "fifty-five million, four hundred forty-one thousand, seven hundred twenty-one".