Properties of the Number 28109

Twenty-Eight Thousand One Hundred Nine

Basics

Value: 28108 → 28109 → 28110

Parity: odd

Prime: Yes

Previous Prime: 28099

Next Prime: 28111

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 28109

Divisors: 1, 28109

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110110111001101

Octal: 66715

Duodecimal: 14325

Hexadecimal: 6dcd

Square: 790115881

Square Root: 167.6573887426379

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

Lesser of twin primes p1 such that p1+(p2²-p1²) and p2+(p2²-p1²) are prime numbers. A174922

Primes q = 4·p+1, where p == 2 (mod 5) is also prime. A221981

Primes whose digits can be arranged in increasing cyclic order - to form a substring of 123456789012345678901234567890... A68710

Square array read by antidiagonals, where the top row is the nonnegative integers and the other numbers are the sum of the neighbors in the preceding row. A217536

Smallest member of a pair of consecutive twin prime pairs that have three primes between them. A89635

Primes p such that p+2 and q are primes, where q is concatenation of binary representations of p and p+2: q = p·2^L + p+2, where L is the length of binary representation of p+2: L=A070939(p+2). A232238

Primes of the form 2·n² + 62·n + 29. A243891

Prime-indexed primes q such that prime(q) + q + 1 is a prime-indexed prime. A318292

Lesser of twin primes P(k) and P(k+1) such that Sd(P(k)) + Sd(P(k+1)) = Sd(k) + Sd(k+1), where Sd(x) is the sum of digits of x. A277111

Binomial transform of A045621. A134377