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55556521 is a prime number
BaseRepresentation
bin1101001111101…
…1100110101001
310212112120012221
43103323212221
5103210302041
65302434041
71243136236
oct323734651
9125476187
1055556521
11293a6489
1216732921
13b6825a7
14754278d
154d262d1
hex34fb9a9

55556521 has 2 divisors, whose sum is σ = 55556522. Its totient is φ = 55556520.

The previous prime is 55556519. The next prime is 55556581. The reversal of 55556521 is 12565555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27878400 + 27678121 = 5280^2 + 5261^2 .

It is a cyclic number.

It is not a de Polignac number, because 55556521 - 21 = 55556519 is a prime.

Together with 55556519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55556581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27778260 + 27778261.

It is an arithmetic number, because the mean of its divisors is an integer number (27778261).

Almost surely, 255556521 is an apocalyptic number.

It is an amenable number.

55556521 is a deficient number, since it is larger than the sum of its proper divisors (1).

55556521 is an equidigital number, since it uses as much as digits as its factorization.

55556521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37500, while the sum is 34.

The square root of 55556521 is about 7453.6246887001. The cubic root of 55556521 is about 381.5736244877.

It can be divided in two parts, 555565 and 21, that multiplied together give a triangular number (11666865 = T4830).

The spelling of 55556521 in words is "fifty-five million, five hundred fifty-six thousand, five hundred twenty-one".