Properties of the Number 545

Five Hundred Forty-Five

Basics

Value: 544 → 545 → 546

Parity: odd

Prime: No

Previous Prime: 541

Next Prime: 547

Digit Sum: 14

Digital Root: 5

Palindrome: Yes

Factorization: 5 × 109

Divisors: 1, 5, 109, 545

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1000100001

Octal: 1041

Duodecimal: 395

Hexadecimal: 221

Square: 297025

Square Root: 23.345235059857504

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

Centered square numbers: a(n) = 2·n*(n+1)+1. Sums of two consecutive squares. Also, consider all Pythagorean triples (X, Y, Z=Y+1) ordered by increasing Z; then sequence gives Z values. A1844

Number of rooted trees with n vertices in which vertices at the same level have the same degree. A3238

Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 2 (most significant digit on right). A61955

a(n) = ceiling(n²/2). A982

Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and w² + x·y = 0. A211422

Start with 1 and repeatedly reverse the decimal digits and add 4 to get the next term. A117828

The a(n)-th composition in standard order (A066099) has alternating sum 0. A344619

Numbers k such that 2^k - 3 is prime. A50414

Numbers that are the sum of 5 positive 4th powers. A3339

Numbers palindromic in bases 10 and 17. A97855