Properties of the Number -1655

Six Hundred Fifty-Five

Basics

Value: -1656 → -1655 → -1654

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 5 × 331

Divisors: 1, 5, 331, 1655

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -11001110111

Octal: -3167

Duodecimal: -B5B

Hexadecimal: -677

Square: 2739025

Square Root: 40.681691213615984

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

Values of n such that L(11) and N(11) are both prime, where L(k) = (n²+n+1)*2^2·k + (2·n+1)*2^k + 1, N(k) = (n²+n+1)*2^k + n. A227449

a(1) = 1; a(n) = -∑_{d∣n, d < n} A341512(n/d) * a(d), where A341512(n) = σ(n)*A003961(n) - n*σ(A003961(n)). A347096

Number of subsets of {1..n} containing all of their pairwise sums <= n. A326083

Numbers m such that the Bernoulli number B_2·m has denominator 66. A51229

Numbers that are the sum of 10 positive 6th powers. A3366

Smallest k such that the k-th composition in standard order has n distinct runs. A351015

a(n) = 2·n² + 3·n + 3. A33816

a(n) = pq + pr + qr with p = prime(n), q = prime(n+1), and r = prime(n+2). A127345

Array read by antidiagonals: T(m,n) is the number of matchings in the stacked prism graph C_m X P_n. A287428

Number of strict integer partitions of n whose first differences (assuming the last part is zero) are unimodal. A332285