Properties of the Number 2861

Two Thousand Eight Hundred Sixty-One

Basics

Value: 2860 → 2861 → 2862

Parity: odd

Prime: Yes

Previous Prime: 2857

Next Prime: 2879

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2861

Divisors: 1, 2861

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101100101101

Octal: 5455

Duodecimal: 17A5

Hexadecimal: b2d

Square: 8185321

Square Root: 53.48831648126533

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

Primes whose decimal representation is a valid number in base 9 and interpreted as such is again a prime. A235395

Primes of the form k² - k - 1. A2327

Number of strict integer partitions of n containing some three possibly equal parts (a,b,c) such that a + b = c. A variation of sum-full strict partitions. A363226

Number of strict integer partitions of n with at least one neighborless part. A356607

Primes p = prime(i) of level (1,3), i.e., such that A118534(i) = prime(i-3). A118467

Numbers n such that the decimal expansions of both n and n² have 1 as smallest digit and 8 as largest digit. A257211

Lower prime of a difference of 18 between consecutive primes. A31936

Number of integer compositions of n whose leaders of strictly increasing runs are themselves strictly increasing. A374688

Primes p with p-1 and p+1 both practical: "Sandwich of the first kind". A210479

a(n) = Frobenius number for 5 successive primes = F[p(n), p(n+1), p(n+2), p(n+3), p(n+4)]. A138991