Properties of the Number 3821

Three Thousand Eight Hundred Twenty-One

Basics

Value: 3820 → 3821 → 3822

Parity: odd

Prime: Yes

Previous Prime: 3803

Next Prime: 3823

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 3821

Divisors: 1, 3821

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111011101101

Octal: 7355

Duodecimal: 2265

Hexadecimal: eed

Square: 14600041

Square Root: 61.814237842102365

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

Numbers n such that n, 2n+1, and 4n+3 all prime. A7700

Primes from merging of 4 successive digits in decimal expansion of e. A104845

Primes of the form x²+101y². A139489

Number of integer partitions of n whose distinct parts are pairwise coprime. A304709

Primes p such that p+2 and 2p+1 are also prime. A45536

Initial primes of Cunningham chains of first type with length exactly 3. Primes in A059453 that survive as primes just two "2p+1 iterations", forming chains of exactly 3 terms. A59762

Smallest prime equal to the sum of 2n+1 consecutive primes. A70934

Triangular array T(n,k), read by rows: coefficients of strong divisibility sequence of polynomials p(1,x) = 1, p(2,x) = 1 + 4·x, p(n,x) = u·p(n-1,x) + v·p(n-2,x) for n >= 3, where u = p(2,x), v = 1 - x - x². A367209

Primes that are the sum of 7 consecutive primes. A82246

Primes such that the sum of the predecessor and successor primes is divisible by 31. A113155