Search a number
BaseRepresentation
bin1001101110101
320211111
41031311
5124411
635021
720344
oct11565
96744
104981
113819
122a71
132362
141b5b
151721
hex1375

4981 has 4 divisors (see below), whose sum is σ = 5292. Its totient is φ = 4672.

The previous prime is 4973. The next prime is 4987. The reversal of 4981 is 1894.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1894 = 2947.

It can be written as a sum of positive squares in 2 ways, for example, as 4356 + 625 = 66^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 4981 - 23 = 4973 is a prime.

It is a super-2 number, since 2×49812 = 49620722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130 + ... + 163.

It is an arithmetic number, because the mean of its divisors is an integer number (1323).

24981 is an apocalyptic number.

It is an amenable number.

4981 is a deficient number, since it is larger than the sum of its proper divisors (311).

4981 is a wasteful number, since it uses less digits than its factorization.

4981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310.

The product of its digits is 288, while the sum is 22.

The square root of 4981 is about 70.5761999544. The cubic root of 4981 is about 17.0780722778.

It can be divided in two parts, 49 and 81, that multiplied together give a square (3969 = 632).

The spelling of 4981 in words is "four thousand, nine hundred eighty-one".

Divisors: 1 17 293 4981