4945 has 8 divisors (see below), whose sum is σ = 6336.
Its totient is φ = 3696.
The previous prime is 4943. The next prime is 4951. The reversal of 4945 is 5494.
Adding to 4945 its product of digits (720), we get a palindrome (5665).
Subtracting from 4945 its product of digits (720), we obtain a square (4225 = 652).
It can be divided in two parts, 4 and 945, that added together give a palindrome (949).
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 4945 - 21 = 4943 is a prime.
It is an alternating number because its digits alternate between even and odd.
It is a Duffinian number.
It is a plaindrome in base 13.
It is not an unprimeable number, because it can be changed into a prime (4943) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94 + ... + 136.
It is an arithmetic number, because the mean of its divisors is an integer number (792).
It is an amenable number.
4945 is a deficient number, since it is larger than the sum of its proper divisors (1391).
4945 is a wasteful number, since it uses less digits than its factorization.
4945 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 71.
The product of its digits is 720, while the sum is 22.
The square root of 4945 is about 70.3206939670.
The cubic root of 4945 is about 17.0368290366.
The spelling of 4945 in words is "four thousand, nine hundred forty-five".