Properties of the Number 1225

One Thousand Two Hundred Twenty-Five

Basics

Value: 1224 → 1225 → 1226

Parity: odd

Prime: No

Previous Prime: 1223

Next Prime: 1229

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

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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

Triangular numbers: a(n) = binomial(n+1,2) = n*(n+1)/2 = 0 + 1 + 2 + ... + n. A217

The squares: a(n) = n². A290

Perfect powers: m^k where m > 0 and k >= 2. A1597

Primorial base exp-function: digits in primorial base representation of n become the exponents of successive prime factors whose product a(n) is. A276086

Hexagonal numbers: a(n) = n*(2·n-1). A384

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

Product of divisors of n. A7955

Powerful numbers (A001694) that are not prime powers (A000961). A286708

Numbers having k prime factors (counted with multiplicity), the largest of which is the k-th prime. A106529

Binomial coefficient C(n,48). A11001