55321897 has 2 divisors, whose sum is σ = 55321898. Its totient is φ = 55321896.

The previous prime is 55321873. The next prime is 55321909. The reversal of 55321897 is 79812355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54819216 + 502681 = 7404^2 + 709^2 .

It is a cyclic number.

It is not a de Polignac number, because 55321897 - 2⁷ = 55321769 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55321817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27660948 + 27660949.

It is an arithmetic number, because the mean of its divisors is an integer number (27660949).

Almost surely, 2^55321897 is an apocalyptic number.

It is an amenable number.

55321897 is a deficient number, since it is larger than the sum of its proper divisors (1).

55321897 is an equidigital number, since it uses as much as digits as its factorization.

55321897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The square root of 55321897 is about 7437.8691168909. The cubic root of 55321897 is about 381.0357179080.

The spelling of 55321897 in words is "fifty-five million, three hundred twenty-one thousand, eight hundred ninety-seven".