Properties of the Number 99981

Ninety-Nine Thousand Nine Hundred Eighty-One

Basics

Value: 99980 → 99981 → 99982

Parity: odd

Prime: No

Previous Prime: 99971

Next Prime: 99989

Digit Sum: 36

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 7 × 23 ²

Divisors: 1, 3, 7, 9, 21, 23, 27, 63, 69, 161

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11000011010001101

Octal: 303215

Duodecimal: 49A39

Hexadecimal: 1868d

Square: 9996200361

Square Root: 316.197722951953

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

a(n) is the last term of the analogous sequence to A121805, but with initial term n, or -1 if that sequence is infinite. A330129

Numbers without comma-successors: these are the numbers k such that if the commas sequence A121805 is started at k instead of 1, there is no second term. A367341

Sieve performed by successive iterations of steps where step m is: keep m terms, remove the next 3 and repeat; as m = 1,2,3,.. the remaining terms form this sequence. A112561

Negative value of coefficient of x^n-6 in the characteristic polynomial of a certain n X n integer circulant matrix. A127411

Bisection of A001358. A99981