Properties of the Number 55557

Fifty-Five Thousand Five Hundred Fifty-Seven

Basics

Value: 55556 → 55557 → 55558

Parity: odd

Prime: No

Previous Prime: 55547

Next Prime: 55579

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 6173

Divisors: 1, 3, 9, 6173, 18519, 55557

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101100100000101

Octal: 154405

Duodecimal: 28199

Hexadecimal: d905

Square: 3086580249

Square Root: 235.7053245049844

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Numbers k with digits 5 and 7 only. A284380

Primes in carryless arithmetic mod 10 in which all digits except the rightmost are zero or five. A169984

a(n) = (5·10ⁿ + 13)/9. A178769

Numbers having four 5's in base 10. A43512

For k in {2,3,...,9} define a sequence as follows: a(0)=0; for n>=0, a(n+1)=a(n)+1, unless a(n) ends in k, in which case a(n+1) is obtained by replacing the last digit of a(n) with the digit(s) of k². This is k(7). A237344

Numbers n such that n+2, n+4, n+6, n+8, n+10, n+12 and n+14 are all semiprimes. A268578

Coefficients of 1/(∑_k>=0 [(k+1)*r]*(-x)^k), where r = 4^1/3 and [ ] = floor. A288231

Indices of primes in sequence defined by A(0) = 47, A(n) = 10·A(n-1) + 17 for n > 0. A101736

Numbers k such that 2^k - 25 is prime. A379020

Numbers k such that 3·R_k - 2 is prime, where R_k = 11...1 is the repunit (A002275) of length k. A55557