Properties of the Number 1215

One Thousand Two Hundred Fifteen

Basics

Value: 1214 → 1215 → 1216

Parity: odd

Prime: No

Previous Prime: 1213

Next Prime: 1217

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ⁵ × 5

Divisors: 1, 3, 5, 9, 15, 27, 45, 81, 135, 243

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10010111111

Octal: 2277

Duodecimal: 853

Hexadecimal: 4bf

Square: 1476225

Square Root: 34.85685011586675

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

Toothpick sequence (see Comments lines for definition). A139250

Numbers that are divisible by exactly 6 primes with multiplicity. A46306

Describe n. Also called the "Say What You See" or "Look and Say" sequence LS(n). A45918

Numbers that are the sum of 5 positive 5th powers. A3350

Number of partitions of n into at most 4 parts. A1400

Numbers of the form 3ⁱ*5^j with i, j >= 0. A3593

Third convolution of the powers of 3 (A000244). A27472

Number of partitions of n in which the greatest part is 4. A26810

Cube of lower triangular normalized binomial matrix. A27465

Numbers with an even number of prime factors (counted with multiplicity) that cannot be factored into distinct semiprimes. A320892