Properties of the Number -3721

Seven Hundred Twenty-One

Basics

Value: -3722 → -3721 → -3720

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 61 ²

Divisors: 1, 61, 3721

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -111010001001

Octal: -7211

Duodecimal: -21A1

Hexadecimal: -e89

Square: 13845841

Square Root: 61

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

Dirichlet g.f.: 1 / ζ(s-2). A334657

Inverse Euler transform of the unsigned Moebius function A008966. A320782

a(1) = 1, a(2) = -5; a(n) = -n² * ∑_{d∣n, d < n} a(d) / d². A359485

Numerator of Euler(n, 3/7). A156196

Squares of primes. A1248

Numbers k such that (16·10^k - 31)/3 is prime. A270929

Odd squares: a(n) = (2n+1)². Also centered octagonal numbers. A16754

1 and the prime powers p^m where m >= 2, thus excluding the primes. A25475

Prime powers p^e where p is a prime and e >= 2 (prime powers without the primes or 1). A246547

Number of partitions of n whose mean is a part. A237984