Properties of the Number -7225

Two Hundred Twenty-Five

Basics

Value: -7226 → -7225 → -7224

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 ² × 17 ²

Divisors: 1, 5, 17, 25, 85, 289, 425, 1445, 7225

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1110000111001

Octal: -16071

Duodecimal: -4221

Hexadecimal: -1c39

Square: 52200625

Square Root: 85

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

Abundances of A188484(n). A188487

Alternating sum of centered 25-gonal numbers. A270693

a(1) = 1; a(2) = 1; a(3) = 1; a(4) = 1; a(5) = 1; a(n) = a(n-1)+4a(n-2)-3a(n-3)-3a(n-4)+a(n-5) for n >= 6. A122608

Triangle read by rows, based on products of Jacobsthal numbers (A001045). A378931

Odd squares: a(n) = (2n+1)². Also centered octagonal numbers. A16754

Squares of the squarefree semiprimes (p²*q²). A85986

Number of double-free integer partitions of n. A323092

Powers of composite squarefree numbers that are not squarefree. A303606

a(n) = (3·n+1)². A16778

Generalized 26-gonal (or icosihexagonal) numbers: m*(12·m - 11) with m = 0, +1, -1, +2, -2, +3, -3, ... A316724