Properties of the Number 55551

Fifty-Five Thousand Five Hundred Fifty-One

Basics

Value: 55550 → 55551 → 55552

Parity: odd

Prime: No

Previous Prime: 55547

Next Prime: 55579

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 18517

Divisors: 1, 3, 18517, 55551

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101100011111111

Octal: 154377

Duodecimal: 28193

Hexadecimal: d8ff

Square: 3085913601

Square Root: 235.69259640472376

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

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

a(n) = (5·10ⁿ - 41)/9 for n > 0. A173804

Numbers having four 5's in base 10. A43512

Semiprimes (A001358) whose digit reversal is a pentagonal number (A000326). A115708

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

Number of n-node rooted identity trees with thinning limbs and root outdegree (branching factor) 7. A245126

Semiprimes formed by concatenating n, n, and 1 for n = 1, 2, 3,.... A210711

a(0) = 0, a(n) = previous term + repunit of length of previous term for n > 0. A247107

Expansion of x*(1 + 5·x + 40·x²)/((1 - x²)*(1 - 10·x²)). A322927

Near-repdigit semiprimes with 5 as repeated digit. A105986