5081661 has 24 divisors (see below), whose sum is σ = 7982520. Its totient is φ = 3115008.

The previous prime is 5081647. The next prime is 5081669. The reversal of 5081661 is 1661805.

5081661 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 324900 + 4756761 = 570^2 + 2181^2 .

It is not a de Polignac number, because 5081661 - 2⁹ = 5081149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5081669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19645 + ... + 19901.

It is an arithmetic number, because the mean of its divisors is an integer number (332605).

Almost surely, 2^5081661 is an apocalyptic number.

It is an amenable number.

5081661 is a deficient number, since it is larger than the sum of its proper divisors (2900859).

5081661 is a wasteful number, since it uses less digits than its factorization.

5081661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 5081661 is about 2254.2539785925. The cubic root of 5081661 is about 171.9234944593.

The spelling of 5081661 in words is "five million, eighty-one thousand, six hundred sixty-one".