Properties of the Number 215

Two Hundred Fifteen

Basics

Value: 214 → 215 → 216

Parity: odd

Prime: No

Previous Prime: 211

Next Prime: 223

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 5 × 43

Divisors: 1, 5, 43, 215

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11010111

Octal: 327

Duodecimal: 15B

Hexadecimal: d7

Square: 46225

Square Root: 14.66287829861518

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

a(n) = 4·n + 3. A4767

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

The Enots Wolley sequence: the lexicographically earliest infinite sequence {a(n)} of distinct positive numbers such that, for n>2, a(n) has a common factor with a(n-1) but not with a(n-2). A336957

Multiples of 5: a(n) = 5·n. A8587

Numbers that are the sum of 4 but no fewer nonzero squares. A4215

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

Numbers k such that the k-th and the (k+1)-st primes are twin primes. A29707

a(n) = 6·n + 5. A16969

Number of compositions of n whose run-lengths are all equal. A329738