Properties of the Number 61209

Sixty-One Thousand Two Hundred Nine

Basics

Value: 61208 → 61209 → 61210

Parity: odd

Prime: No

Previous Prime: 61169

Next Prime: 61211

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 2267

Divisors: 1, 3, 9, 27, 2267, 6801, 20403, 61209

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1110111100011001

Octal: 167431

Duodecimal: 2B509

Hexadecimal: ef19

Square: 3746541681

Square Root: 247.40452704023022

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

Smallest positive number whose digits concatenated with all previous terms forms a perfect square. A51671

Denominators of continued fraction convergents to sqrt(357). A41677

G.f.: A(x) = ∏_n>=1 1/(1 - A007947(n)*xⁿ)^1/n, where A007947(n) is the product of the distinct prime factors of n. A94947

a(n) is the number of 5 element sets of distinct integer-sided trapezoids whose base angles are 60 degrees that fill an equilateral triangular grid of side n units without partitioning a triangle into 3 element sets of trapezoids. A391452

Numbers n such that product of double factorials of the digits of n equals σ(n). A158989

Numbers which are the cubes of their digit sum. A61209

a(n) = (1/5ⁿ) * ∑_k=0..n² ( (binomial(n², k) * 4^k) (mod 5ⁿ) ). A376534