55395521 has 2 divisors, whose sum is σ = 55395522. Its totient is φ = 55395520.

The previous prime is 55395479. The next prime is 55395541. The reversal of 55395521 is 12559355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35046400 + 20349121 = 5920^2 + 4511^2 .

It is a cyclic number.

It is not a de Polignac number, because 55395521 - 2²² = 51201217 is a prime.

It is a super-2 number, since 2×55395521² = 6137327493722882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55395541) 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, 27697760 + 27697761.

It is an arithmetic number, because the mean of its divisors is an integer number (27697761).

Almost surely, 2^55395521 is an apocalyptic number.

It is an amenable number.

55395521 is a deficient number, since it is larger than the sum of its proper divisors (1).

55395521 is an equidigital number, since it uses as much as digits as its factorization.

55395521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33750, while the sum is 35.

The square root of 55395521 is about 7442.8167383055. The cubic root of 55395521 is about 381.2046741421.

The spelling of 55395521 in words is "fifty-five million, three hundred ninety-five thousand, five hundred twenty-one".