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55678121 is a prime number
BaseRepresentation
bin1101010001100…
…1010010101001
310212202202000122
43110121102221
5103223144441
65305213025
71244153612
oct324312251
9125682018
1055678121
1129479884
1216791175
13b6c5a45
147574c09
154d4c34b
hex35194a9

55678121 has 2 divisors, whose sum is σ = 55678122. Its totient is φ = 55678120.

The previous prime is 55678109. The next prime is 55678141. The reversal of 55678121 is 12187655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37945600 + 17732521 = 6160^2 + 4211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-55678121 is a prime.

It is not a weakly prime, because it can be changed into another prime (55678141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27839060 + 27839061.

It is an arithmetic number, because the mean of its divisors is an integer number (27839061).

Almost surely, 255678121 is an apocalyptic number.

It is an amenable number.

55678121 is a deficient number, since it is larger than the sum of its proper divisors (1).

55678121 is an equidigital number, since it uses as much as digits as its factorization.

55678121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 35.

The square root of 55678121 is about 7461.7773351930. Note that the first 3 decimals coincide. The cubic root of 55678121 is about 381.8518129021.

The spelling of 55678121 in words is "fifty-five million, six hundred seventy-eight thousand, one hundred twenty-one".