Properties of the Number -1225

Two Hundred Twenty-Five

Basics

Value: -1226 → -1225 → -1224

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 5 ² × 7 ²

Divisors: 1, 5, 7, 25, 35, 49, 175, 245, 1225

Polygonal

Triangular: Yes

Square: Yes

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -10011001001

Octal: -2311

Duodecimal: -861

Hexadecimal: -4c9

Square: 1500625

Square Root: 35

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

Alternating sum of cubes, i.e., ∑_k=0..n k^p*q^k for p=3, q=-1. A232599

Alternating sum of squares to n. A89594

Determinant of the n X n (0,1)-matrix with (i,j)-entry equal to 1 if and only if i + j is 2 or an odd composite number. A228591

Matrix inverse of the Narayana triangle A001263. A103364

Irregular triangle read by rows of normalized Girard-Waring formula (cf. A210258), for m=7 data values. A288245

Triangle read by rows, the coefficients of the polynomials generating the columns of A287316. A287314

Determinant of n X n matrix defined by m(i,j)=1 if i²+j² is a prime, m(i,j)=0 otherwise. A71524

Signed triangle of D'Arcais numbers (A008298) : coefficients of r in the polynomials generated by the series coefficients of zⁿ in Product[(1-z^k)^r, {k,1,Inf}]*(n!). A78521

Triangle read by rows: coefficients of Yablonskii-Vorob'ev polynomials. A92766

T(n, k) = Stirling1(n+1, k) - Stirling1(n, k-1), for 1 <= k <= n. Triangle read by rows. A94485