Properties of the Number 61505

Sixty-One Thousand Five Hundred Five

Basics

Value: 61504 → 61505 → 61506

Parity: odd

Prime: No

Previous Prime: 61493

Next Prime: 61507

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 5 × 12301

Divisors: 1, 5, 12301, 61505

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1111000001000001

Octal: 170101

Duodecimal: 2B715

Hexadecimal: f041

Square: 3782865025

Square Root: 248.0020161208372

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) = 81·n² - 72·n + 17. A154277

a(n) = 64·n² + 1. A158686

Numbers k such that distances from k to three nearest squares are three triangular numbers. A232501

Number of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 4 6 or 7. A252434

Leading digit of nⁿ. A61505

a(n) = (a(n-1) + n)/2^k where 2^k is the largest power of 2 dividing a(n-1) + n, for n>1 with a(1)=1. A208884