Properties of the Number -121749

One Hundred Twenty-One Thousand Seven Hundred Forty-Nine

Basics

Value: -121750 → -121749 → -121748

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 40583

Divisors: 1, 3, 40583, 121749

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11101101110010101

Octal: -355625

Duodecimal: -5A559

Hexadecimal: -1db95

Square: 14822819001

Square Root: 348.92549347962523

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) = ∑_j=1..n ∑_k=1..n φ(j·k). A372633

Triangle read by rows: T(n,k) is the number of hill-free Dyck paths of semilength n and having k UUDD's, where U=(1,1) and D=(1,-1) (0<=k<=floor(n/2), n>=2). A hill in a Dyck path is a peak at level 1. A105640

a(1) = a(2) = 1. a(n) = a(n-1) + (largest noncomposite {1 or prime} among the first n-2 terms of the sequence). A120761

a(0) = 0, a(1) = 1, and b = a(n-2) + a(n-1). a(n) = b if b is a prime; otherwise a(n) = a(n-1) and a(n-1) = b. A346957