Properties of the Number -7809

Eight Hundred Nine

Basics

Value: -7810 → -7809 → -7808

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 19 × 137

Divisors: 1, 3, 19, 57, 137, 411, 2603, 7809

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1111010000001

Octal: -17201

Duodecimal: -4629

Hexadecimal: -1e81

Square: 60980481

Square Root: 88.3685464404615

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 that are the sum of 3 positive 5th powers. A3348

Numbers k such that the smoothly undulating palindromic number (4·10^k-7)/33 = 121...21 is a prime (or PRP). A62209

Least k > 0 such that gcd(kⁿ+2, (k+1)ⁿ+2) > 1, or 0 if there is no such k. A255852

Least m > 0 such that gcd(m²ⁿ⁺¹+2, (m+1)²ⁿ⁺¹+2) > 1. A255832

Sizes of successive clusters in Z⁴ lattice. A46895

a(n) = ((n⁶ - (n-1)⁶) - (n² - (n-1)²))/60. A79547

a(n) = (11·n² - 7·n)/2. A180223

Starting numbers for which the RATS sequence has eventual period 14. A114615

Numbers k such that k*(k+2) gives the concatenation of a number m with itself. A116286

Sum of distinct positive fifth powers. A194768