Properties of the Number 90109

Ninety Thousand One Hundred Nine

Basics

Value: 90108 → 90109 → 90110

Parity: odd

Prime: No

Previous Prime: 90107

Next Prime: 90121

Digit Sum: 19

Digital Root: 1

Palindrome: Yes

Factorization: 251 × 359

Divisors: 1, 251, 359, 90109

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8109 Try Today's Challenge

Representations

Binary: 10101111111111101

Octal: 257775

Duodecimal: 44191

Hexadecimal: 15ffd

Square: 8119631881

Square Root: 300.1816116953202

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

Number T(n,k) of permutations p of [n] such that k is the maximum of 0 and the number of elements in any integer interval [p(i)..i+n*[i<p(i)]]; triangle T(n,k), n>=0, 0<=k<=n, read by rows. A324563

Number T(n,k) of permutations p of [n] such that n-k is the maximum of 0 and the number of elements in any integer interval [p(i)..i+n*[i<p(i)]]; triangle T(n,k), n>=0, 0<=k<=n, read by rows. A324564

10ⁿ-th palindrome. A83816

Palindromes that start with 9. A43044

Palindromic composite numbers starting with a digit 9. A222729

Number of permutations p of [1+n] such that n is the maximum of the number of elements in any integer interval [p(i)..i+(1+n)*[i<p(i)]]. A324621

Palindromes that cannot be expressed as the difference of two palindromes. A83142

a(n) = 2·a(n-1)+3 with n>1, a(1)=8. A156198

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

Number of permutations p of [n] such that eight is the maximum of the number of elements in any integer interval [p(i)..i+n*[i<p(i)]]. A324635