Properties of the Number 8515

Eight Thousand Five Hundred Fifteen

Basics

Value: 8514 → 8515 → 8516

Parity: odd

Prime: No

Previous Prime: 8513

Next Prime: 8521

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 × 13 × 131

Divisors: 1, 5, 13, 65, 131, 655, 1703, 8515

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000101000011

Octal: 20503

Duodecimal: 4B17

Hexadecimal: 2143

Square: 72505225

Square Root: 92.27675763701279

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 9-gonal (also known as nonagonal or enneagonal) numbers. Every third triangular number, starting with a(1)=1. A60544

a(n) = p*(p-1)/2 for p = prime(n). A8837

Array read by antidiagonals: T(m,n) is the number of m X n binary arrays with all 1's connected, a path of 1's from top row to lower right corner, and no 1 having more than two 1's adjacent. A391823

Primitive numbers in A229307. A229311

Primitive numbers in A229304. A229308

Primitive numbers in A229305. A229309

Primitive numbers in A229306. A229310

a(n) = (2·n-1)*(4·n-1). A33567

Number of heptagonal regions in regular n-gon with all diagonals drawn. A67154

Positive integers not expressible as the sum of a prime and a triangular number. A76768