Properties of the Number 90209

Ninety Thousand Two Hundred Nine

Basics

Value: 90208 → 90209 → 90210

Parity: odd

Prime: No

Previous Prime: 90203

Next Prime: 90217

Digit Sum: 20

Digital Root: 2

Palindrome: Yes

Factorization: 7 ³ × 263

Divisors: 1, 7, 49, 263, 343, 1841, 12887, 90209

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10110000001100001

Octal: 260141

Duodecimal: 44255

Hexadecimal: 16061

Square: 8137663681

Square Root: 300.34813134094907

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

Palindromic in bases 10 and 16. A29731

Smallest palindromic number of 5 digits in two bases differing by n. A216899

Number T(n,k) of Dyck paths of semilength n having exactly k (possibly overlapping) occurrences of the consecutive steps UDUUUDDDUD (with U=(1,1), D=(1,-1)); triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-1)/4)), read by rows. A243881

Palindromes that start with 9. A43044

Palindromic composite numbers starting with a digit 9. A222729

a(n) is the largest integer value of ∏_k=1..n (2 + 1/t_k) with integers t_k > 1. A355243

Numbers n with property that n² starts and ends with 81. A159775

Number of Dyck paths of semilength n having exactly 1 occurrence of the consecutive steps UDUUUDDDUD (with U=(1,1), D=(1,-1)). A243871

Generalized Bell numbers (from (5,5)-Stirling2 array A090216). A90209