Properties of the Number -27

Twenty-Seven

Basics

Value: -28 → -27 → -26

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ³

Divisors: 1, 3, 9, 27

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: -11011

Octal: -33

Duodecimal: -23

Hexadecimal: -1b

Square: 729

Square Root: 5.196152422706632

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

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

Canonical enumeration of integers: interleaved positive and negative integers with zero prepended. A1057

a(0) = 0; thereafter a(n) is the least integer (in absolute value) not yet in the sequence such that the absolute difference between a(n-1) and a(n) is a square; in case of a tie, preference is given to the positive value. A377091

a(n) = 2 - n. A22958

Balanced ternary enumeration (based on balanced ternary representation) of integers; write n in ternary and then replace 2's with (-1)'s. A117966

a(n) = A003961(n) - 2·n. A252748

Scaled Chebyshev U-polynomials evaluated at sqrt(3)/2; expansion of 1/(1 - 3·x + 3·x²). A57083

Alternating sum of all prime factors of n; primes nondecreasing, starting with the least prime factor: A020639(n). A71321

a(n) = (n+1)*(2-n)/2. A80956

Triangle read by rows: T(n,k) = T(n-1,k-1) + T(n-1,k), 0 < k < n with T(n,0) = n and T(n,n) = -n. A214292

a(0)=0; thereafter a(2n) = 2a(n), a(2n+1) = -2a(n) + 1. A65620