Properties of the Number 1491

One Thousand Four Hundred Ninety-One

Basics

Value: 1490 → 1491 → 1492

Parity: odd

Prime: No

Previous Prime: 1489

Next Prime: 1493

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 71

Divisors: 1, 3, 7, 21, 71, 213, 497, 1491

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10111010011

Octal: 2723

Duodecimal: A43

Hexadecimal: 5d3

Square: 2223081

Square Root: 38.61346915261564

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

9-gonal (or enneagonal or nonagonal) numbers: a(n) = n*(7·n-5)/2. A1106

Generalized 9-gonal (or enneagonal) numbers: m*(7·m - 5)/2 with m = 0, 1, -1, 2, -2, 3, -3, ... A118277

Numbers > 1000 such that all the substrings of length = 3 are primes (substrings with leading '0' are considered to be nonprime). A211684

Numbers m such that there are precisely 3 groups of order m. A55561

Number of integer compositions of n with the same length as their alternating sum. A357182

Mountain numbers. A134941

Number of pairwise coprime compositions of n, where a singleton is not considered coprime unless it is (1). A337462

(Prime(n)# - 4)/2 is prime, where x# is the primorial A034386(x). A67026

Interprimes (A024675) which are of the form s·prime, s=21. A75296

Iterate the map in A006369 starting at 8. A28394