Properties of the Number 213

Two Hundred Thirteen

Basics

Value: 212 → 213 → 214

Parity: odd

Prime: No

Previous Prime: 211

Next Prime: 223

Digit Sum: 6

Digital Root: 6

Palindrome: No

Factorization: 3 × 71

Divisors: 1, 3, 71, 213

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11010101

Octal: 325

Duodecimal: 159

Hexadecimal: d5

Square: 45369

Square Root: 14.594519519326424

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 in base 5. A7091

Numbers in base 4. A7090

a(n) = 4·n + 1. A16813

Odd semiprimes: odd numbers divisible by exactly 2 primes (counted with multiplicity). A46315

Number of fractions in Farey series of order n. A5728

Binary irreducible polynomials (primes in the ring GF(2)[X]), evaluated at X=2. A14580

a(n) = 6·n+3. A16945

Odd numbers of the form p·q where p and q are distinct primes. A46388

Numbers m such that 6m-1, 6m+1 are twin primes. A2822

All primes that divide n are of the form prime(2k), where prime(k) is k-th prime. A66207

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