Properties of the Number 28181

Twenty-Eight Thousand One Hundred Eighty-One

Basics

Value: 28180 → 28181 → 28182

Parity: odd

Prime: Yes

Previous Prime: 28163

Next Prime: 28183

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 28181

Divisors: 1, 28181

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110111000010101

Octal: 67025

Duodecimal: 14385

Hexadecimal: 6e15

Square: 794168761

Square Root: 167.87197502859135

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 of form n² + 625. A256777

Primes having only {1, 2, 8} as digits. A385775

Sum of composite numbers between prime p and nextprime(p) is palindromic. A54266

Least number with exactly n distinct divisors of prime indices. Position of first appearance of n in A370820. A371131

Integer part of Gauss's Arithmetic-Geometric Mean M(2,n⁴). A127765

Number of ternary rooted trees with n nodes and height at most 6. A36374

Sorted list of positions of first appearances in the sequence A370820, which counts distinct divisors of prime indices. A371181

Lesser of consecutive primes whose average is a palindromic number. A242387

Primes whose index is divisible by the product of its digits. A306766

Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 13. A31601