Properties of the Number 2147

Two Thousand One Hundred Forty-Seven

Basics

Value: 2146 → 2147 → 2148

Parity: odd

Prime: No

Previous Prime: 2143

Next Prime: 2153

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 19 × 113

Divisors: 1, 19, 113, 2147

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100001100011

Octal: 4143

Duodecimal: 12AB

Hexadecimal: 863

Square: 4609609

Square Root: 46.33573135281238

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

Pentagonal numbers: a(n) = n*(3·n-1)/2. A326

Number of fib00 primes (A095082) in range [2ⁿ,2ⁿ⁺¹]. A95062

a(n) = (prime(n)² - 1)/24. A24702

Pentagonal numbers with even index. A49452

a(n) = 2·n² + 3·n + 3. A33816

a(n) = a(n-1) + a(m) for n >= 4, where m = 2^p+1 + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^p+1, starting with a(1) = a(2) = 1 and a(3) = 2. A50029

Decimal part of cube root of n starts with 9: first term of runs. A34135

Numbers of the form m*(6·m-1) and m*(6·m+1), where m is an integer. A36498

Positive numbers whose product of digits is four times their sum. A62036

Numbers n such that φ(n)=2*φ(n-1). A171271