55122521 has 2 divisors, whose sum is σ = 55122522. Its totient is φ = 55122520.

The previous prime is 55122497. The next prime is 55122527. The reversal of 55122521 is 12522155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36966400 + 18156121 = 6080^2 + 4261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55122521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55122527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27561260 + 27561261.

It is an arithmetic number, because the mean of its divisors is an integer number (27561261).

Almost surely, 2^55122521 is an apocalyptic number.

It is an amenable number.

55122521 is a deficient number, since it is larger than the sum of its proper divisors (1).

55122521 is an equidigital number, since it uses as much as digits as its factorization.

55122521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000, while the sum is 23.

The square root of 55122521 is about 7424.4542560379. The cubic root of 55122521 is about 380.5774254582.

Adding to 55122521 its reverse (12522155), we get a palindrome (67644676).

The spelling of 55122521 in words is "fifty-five million, one hundred twenty-two thousand, five hundred twenty-one".