Properties of the Number 90099

Ninety Thousand Ninety-Nine

Basics

Value: 90098 → 90099 → 90100

Parity: odd

Prime: No

Previous Prime: 90089

Next Prime: 90107

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 47 × 71

Divisors: 1, 3, 9, 27, 47, 71, 141, 213, 423, 639

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10101111111110011

Octal: 257763

Duodecimal: 44183

Hexadecimal: 15ff3

Square: 8117829801

Square Root: 300.1649546499391

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

Numbers whose set of base 10 digits is {0,9}. A97256

Define two triangular arrays by: B(0,0)=C(0,0)=1, B(0,r)=C(0,r)=0 for r>0, C(t,-1)=C(t,0); and for t,r >= 0, B(t+1,r)=C(t,r-1)+2C(t,r)-B(t,r), C(t+1,r)=B(t+1,r)+2B(t+1,r+1)-C(t,r). Sequence gives array C(t,r) read by rows. A177020

Decimal expansion of the constant ∑_k>=1 log(k + 1) / (k * (k + 1)). A131688

Decimal expansion of the number c = ∑_n>=1 (ζ(n+1)-1)/n. A85361

Decimal expansion of a partial sum limiting constant related to the Lüroth representation of real numbers. A244109

Decimal expansion of U = ∏_k>=1 (k^1/(k*(k+1))), a Khintchine-like limiting constant related to Lüroth's representation of real numbers. A245254

Maximum number of unit squares aligned with unit-spaced horizontal lines that can be enclosed by a circle of radius n. A124484

Euler characteristics of polytopes. A6481

Extremal values of Euler characteristics of polytopes. A320996

Euler characteristics of polytopes. A6482