Properties of the Number 841

Eight Hundred Forty-One

Basics

Value: 840 → 841 → 842

Parity: odd

Prime: No

Previous Prime: 839

Next Prime: 853

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 29 ²

Divisors: 1, 29, 841

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101001001

Octal: 1511

Duodecimal: 5A1

Hexadecimal: 349

Square: 707281

Square Root: 29

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

The squares: a(n) = n². A290

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

Squares of primes. A1248

Powerful numbers, definition (1): if a prime p divides n then p² must also divide n (also called squareful, square full, square-full or 2-powerful numbers). A1694

Centered square numbers: a(n) = 2·n*(n+1)+1. Sums of two consecutive squares. Also, consider all Pythagorean triples (X, Y, Z=Y+1) ordered by increasing Z; then sequence gives Z values. A1844

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

1 and the prime powers p^m where m >= 2, thus excluding the primes. A25475

Squares and twice squares. A28982

Prime powers p^e where p is a prime and e >= 2 (prime powers without the primes or 1). A246547

a(n) = ceiling(n²/2). A982